CN102207575B - Polarizing element and manufacturing method thereof - Google Patents

Abstract

Translated fromChinese

本发明涉及一种光学偏光元件，其包括一支撑体和一设置于该支撑体的偏光膜，该偏光膜为至少一层碳纳米管薄膜，所述碳纳米管薄膜为由多个碳纳米管通过范德华力相互结合形成的宽度为1厘米至10厘米的连续的整体结构，该至少一层碳纳米管薄膜中的碳纳米管沿同一方向择优取向排列。由于碳纳米管具有高温的热稳定性，且对于各种波长的电磁波均有均一的吸收特性，故本发明的偏光元件对于各种波长的电磁波也有均一的偏振吸收性能，具有广泛的应有范围。本发明还涉及一种光学偏光元件的制备方法。

The invention relates to an optical polarizing element, which comprises a support body and a polarizing film arranged on the support body, the polarizing film is at least one layer of carbon nanotube film, and the carbon nanotube film is composed of a plurality of carbon nanotubes A continuous overall structure with a width of 1 cm to 10 cm is formed by van der Waals' mutual combination, and the carbon nanotubes in the at least one layer of carbon nanotube film are preferentially aligned along the same direction. Since carbon nanotubes have high temperature thermal stability and have uniform absorption characteristics for electromagnetic waves of various wavelengths, the polarizing element of the present invention also has uniform polarization absorption characteristics for electromagnetic waves of various wavelengths, and has a wide application range. . The invention also relates to a preparation method of the optical polarizing element.

Description

Translated fromChinese

偏光元件及其制备方法Polarizing element and its preparation method

本案是申请人在2007年3月30日申请的申请号为200710073765.8，名称为“偏光元件及其制备方法”的分案申请。This case is a divisional application filed by the applicant on March 30, 2007 with the application number 200710073765.8 and the name "Polarizing Element and Its Preparation Method".

技术领域technical field

本发明涉及一种光学器件及其制备方法，尤其涉及一种偏光元件及其制备方法。The invention relates to an optical device and a preparation method thereof, in particular to a polarizing element and a preparation method thereof.

背景技术Background technique

偏光元件是一种重要的光学器件，被广泛应用于太阳镜和液晶显示器中。现在广泛应用的一种偏光元件，可吸收一个偏振态的光，而另一偏振态的光则通过偏光元件。此种偏光元件通常采用这样一种方法制得：将二向色性分子溶于或吸收在高分子物质中，如聚乙烯醇，并将所得薄膜以一个方向拉伸配列二向色性分子。这时，二向色性分子沿着拉伸方向有规则排列起来，形成一条长链。在入射光波中，光振动方向平行于长链方向的被吸收，垂直于长链方向的能透过，所以透射光成为线偏振光。此种偏光元件也可以通过将二向色性分子吸收在单轴拉伸的聚合物膜上的方法来生产。Polarizer is an important optical device widely used in sunglasses and liquid crystal displays. A polarizing element that is widely used now can absorb light of one polarization state, while light of another polarization state passes through the polarizing element. Such a polarizing element is usually produced by dissolving or absorbing dichroic molecules in a polymer substance, such as polyvinyl alcohol, and stretching the resulting film in one direction to align the dichroic molecules. At this time, the dichroic molecules are regularly arranged along the stretching direction to form a long chain. In the incident light wave, the light vibration direction parallel to the long chain direction is absorbed, and the light vibration direction perpendicular to the long chain direction can be transmitted, so the transmitted light becomes linearly polarized light. Such polarizing elements can also be produced by absorbing dichroic molecules on a uniaxially stretched polymer film.

由于此种偏光元件的制造需要将二向色性分子结合高分子聚合物作为偏光膜，制备过程较为复杂。而应用高分子聚合物作为偏光膜的偏光元件于50℃以上使用一段时间后，偏光膜的偏光率减少，甚至失去偏光作用。而且此类偏光元件对湿度要求也较高，一旦工作环境恶劣，湿度大，偏光元件将失去偏光作用。Since the manufacture of such a polarizing element needs to combine dichroic molecules with high molecular polymers as a polarizing film, the preparation process is relatively complicated. However, after a polarizing element using a polymer as a polarizing film is used for a period of time above 50° C., the polarizing rate of the polarizing film decreases, or even loses its polarizing effect. Moreover, this type of polarizing element also has high requirements on humidity. Once the working environment is harsh and the humidity is high, the polarizing element will lose its polarizing effect.

另外，现有的偏光元件一般只对某一波段的电磁波(如微波、红外光、可见光、紫外光等)具有良好的偏振性能，无法对各种波长的电磁波有均一的偏振吸收特性。In addition, the existing polarizing elements generally only have good polarization performance for electromagnetic waves of a certain wavelength band (such as microwave, infrared light, visible light, ultraviolet light, etc.), and cannot have uniform polarization absorption characteristics for electromagnetic waves of various wavelengths.

因此，确有必要提供一种对各种波长的电磁波均具有良好的偏振性能的偏光元件及其制备方法，该偏光元件制备简单，且在高温、高湿环境中也能具有良好的偏光作用。Therefore, it is indeed necessary to provide a polarizing element with good polarization properties for electromagnetic waves of various wavelengths and a preparation method thereof. The polarizing element is easy to prepare and can also have good polarizing effect in high temperature and high humidity environments.

发明内容Contents of the invention

一种偏光元件，其包括一支撑体和一设置于该支撑体的偏光膜，该偏光膜为一层碳纳米管薄膜或堆叠的多层碳纳米管薄膜组成，所述碳纳米管薄膜为由多个首尾相连的碳纳米管束以择优取向排列形成的连续的薄膜结构，该碳纳米管薄膜。A polarizing element, which includes a support and a polarizing film arranged on the support, the polarizing film is composed of a layer of carbon nanotube film or stacked multilayer carbon nanotube film, and the carbon nanotube film is composed of The carbon nanotube film is a continuous film structure formed by a plurality of end-to-end carbon nanotube bundles arranged in a preferred orientation.

一种偏光元件，其包括一支撑体和一设置于该支撑体的偏光膜，所述偏光膜为20或30层碳纳米管薄膜重叠设置构成，所述20或30层碳纳米管薄膜中的碳纳米管薄膜为多个由范德华力首尾相连的碳纳米管束以择优取向排列形成的连续的薄膜结构，该碳纳米管薄膜的宽度为1厘米至10厘米。A polarizing element, which includes a support and a polarizing film arranged on the support, the polarizing film is composed of 20 or 30 layers of carbon nanotube films stacked, and the 20 or 30 layers of carbon nanotube films are The carbon nanotube film is a continuous film structure formed by a plurality of carbon nanotube bundles connected end to end by van der Waals force and arranged in a preferred orientation, and the width of the carbon nanotube film is 1 cm to 10 cm.

一种偏光元件，其包括一支撑体和一设置于该支撑的偏光膜，所述偏光膜为多个碳纳米管薄膜并排无间隙覆盖于所述支撑体上，所述支撑体的宽度大于所述碳纳米管薄膜的宽度，所述多个碳纳米管薄膜中的每个碳纳米管薄膜为由多个碳纳米管束通过范德华力首尾相连形成的宽度为1厘米至10厘米的连续的薄膜结构，所述多个碳纳米管束优取向排列。A polarizing element, which includes a support and a polarizing film arranged on the support, the polarizing film is a plurality of carbon nanotube films side by side covering the support without gaps, the width of the support is greater than the The width of the carbon nanotube film, each carbon nanotube film in the plurality of carbon nanotube films is a continuous film structure with a width of 1 cm to 10 cm formed by a plurality of carbon nanotube bundles connected end to end by van der Waals force , the preferred alignment of the plurality of carbon nanotube bundles.

相较于现有技术，所述的偏光元件采用多层碳纳米管薄膜作为偏振膜，由于碳纳米管具有高温的热稳定性，对于各种波长的电磁波有均一的吸收特性，故本发明的偏光元件对于各种波长的电磁波有均一的偏振吸收性能，具有广泛的应有范围。Compared with the prior art, the polarizing element adopts a multilayer carbon nanotube film as a polarizing film. Since carbon nanotubes have high temperature thermal stability and have uniform absorption characteristics for electromagnetic waves of various wavelengths, the present invention The polarizing element has uniform polarization absorption performance for electromagnetic waves of various wavelengths, and has a wide application range.

附图说明Description of drawings

图1为本发明实施例偏光元件的结构示意图。FIG. 1 is a schematic structural diagram of a polarizing element according to an embodiment of the present invention.

图2为本发明实施例偏光元件的制备方法的流程图。FIG. 2 is a flowchart of a method for preparing a polarizing element according to an embodiment of the present invention.

图3为本发明实施例有机溶剂处理前的偏光元件的扫描电镜照片。FIG. 3 is a scanning electron micrograph of a polarizing element before being treated with an organic solvent according to an embodiment of the present invention.

图4为本发明实施例有机溶剂处理后的偏光元件的扫描电镜照片。FIG. 4 is a scanning electron micrograph of a polarizing element treated with an organic solvent according to an embodiment of the present invention.

图5为本发明实施例采用不同层数的碳纳米管薄膜的偏光元件在各波长下的偏振度对比示意图。FIG. 5 is a schematic diagram of comparison of polarization degrees at various wavelengths of polarizing elements using carbon nanotube films with different layers according to an embodiment of the present invention.

具体实施方式Detailed ways

下面将结合附图对本发明作进一步的详细说明。The present invention will be further described in detail below in conjunction with the accompanying drawings.

请参阅图1，本发明提供一种偏光元件10，该偏光元件10包括一支撑体12和一由支撑体12支撑的碳纳米管薄膜14。该支撑体12可为一固定框架或一透明基板。该碳纳米管薄膜14直接粘附于固定框架或透明基板表面作为偏光膜。该碳纳米管薄膜14可为一层或堆叠的多层薄膜结构。每层碳纳米管薄膜14为多个首尾相连的碳纳米管束以择优取向排列形成的薄膜结构。当该碳纳米管薄膜14为多层时，该碳纳米管薄膜14中碳纳米管束基本沿同一方向定向排列。Referring to FIG. 1 , the present invention provides a polarizer 10 , which includes a support 12 and a carbon nanotube film 14 supported by the support 12 . The supporting body 12 can be a fixed frame or a transparent substrate. The carbon nanotube film 14 is directly adhered to the fixed frame or the surface of the transparent substrate as a polarizing film. The carbon nanotube film 14 can be a layer or stacked multi-layer film structure. Each layer of carbon nanotube film 14 is a film structure formed by a plurality of end-to-end carbon nanotube bundles arranged in a preferred orientation. When the carbon nanotube film 14 is multi-layered, the carbon nanotube bundles in the carbon nanotube film 14 are basically aligned along the same direction.

本发明实施例中该碳纳米管薄膜14的宽度可为1cm～10cm，该碳纳米管薄膜14的厚度为0.01～100微米。本发明实施例偏光元件10的偏振吸收性能和碳纳米管薄膜14的层数有关，碳纳米管薄膜14层数越多，该偏光元件10的偏振性能越好。In the embodiment of the present invention, the width of the carbon nanotube film 14 may be 1 cm-10 cm, and the thickness of the carbon nanotube film 14 is 0.01-100 microns. The polarization absorption performance of the polarizing element 10 in the embodiment of the present invention is related to the number of layers of the carbon nanotube film 14 , the more layers of the carbon nanotube film 14 , the better the polarization performance of the polarizing element 10 .

由于碳纳米管对电磁波的吸收接近绝对黑体，碳纳米管对于各种波长的电磁波均有均一的吸收特性，故本发明的偏光元件10对于各种波长的电磁波也有均一的偏振吸收性能。当光波入射时，振动方向平行于碳纳米管束长度方向的光被吸收，垂直于碳纳米管束长度方向的光能透过，所以透射光成为线偏振光。Since the absorption of electromagnetic waves by carbon nanotubes is close to that of an absolute black body, and carbon nanotubes have uniform absorption characteristics for electromagnetic waves of various wavelengths, the polarizing element 10 of the present invention also has uniform polarization absorption characteristics for electromagnetic waves of various wavelengths. When the light wave is incident, the light whose vibration direction is parallel to the length direction of the carbon nanotube bundle is absorbed, and the light perpendicular to the length direction of the carbon nanotube bundle can be transmitted, so the transmitted light becomes linearly polarized light.

请参阅图2，本发明实施例偏光元件10的制备方法主要包括以下几个步骤：Please refer to FIG. 2 , the preparation method of the polarizing element 10 according to the embodiment of the present invention mainly includes the following steps:

步骤一：提供一碳纳米管阵列，优选地，该阵列为超顺排碳纳米管阵列。Step 1: providing a carbon nanotube array, preferably, the array is a super-aligned carbon nanotube array.

本实施例中，超顺排碳纳米管阵列的制备方法采用化学气相沉积法，其具体步骤包括：(a)提供一平整基底，该基底可选用P型或N型硅基底，或选用形成有氧化层的硅基底，本实施例优选为采用4英寸的硅基底；(b)在基底表面均匀形成一催化剂层，该催化剂层材料可选用铁(Fe)、钴(Co)、镍(Ni)或其任意组合的合金之一；(c)将上述形成有催化剂层的基底在700～900℃的空气中退火约30分钟～90分钟；(d)将处理过的基底置于反应炉中，在保护气体环境下加热到500～740℃，然后通入碳源气体反应约5～30分钟，生长得到超顺排碳纳米管阵列，其高度为200～400微米。该超顺排碳纳米管阵列为多个彼此平行且垂直于基底生长的碳纳米管形成的纯碳纳米管阵列。通过上述控制生长条件，该超顺排碳纳米管阵列中基本不含有杂质，如无定型碳或残留的催化剂金属颗粒等。该碳纳米管阵列中的碳纳米管彼此通过范德华力紧密接触形成阵列。In this embodiment, the preparation method of the super-parallel carbon nanotube array adopts the chemical vapor deposition method, and its specific steps include: (a) providing a flat substrate, which can be a P-type or N-type silicon substrate, or a silicon substrate formed with The silicon base of oxide layer, present embodiment preferably adopts the silicon base of 4 inches; (b) uniformly form a catalyst layer on the base surface, this catalyst layer material can be selected iron (Fe), cobalt (Co), nickel (Ni) or one of alloys in any combination thereof; (c) annealing the above-mentioned substrate formed with a catalyst layer in air at 700-900° C. for about 30 minutes to 90 minutes; (d) placing the treated substrate in a reaction furnace, Heating to 500-740° C. under a protective gas environment, and then introducing carbon source gas to react for about 5-30 minutes, and growing super-parallel carbon nanotube arrays with a height of 200-400 microns. The super-parallel carbon nanotube array is a pure carbon nanotube array formed by a plurality of carbon nanotubes growing parallel to each other and perpendicular to the substrate. By controlling the growth conditions above, the super-aligned carbon nanotube array basically does not contain impurities, such as amorphous carbon or residual catalyst metal particles. The carbon nanotubes in the carbon nanotube array are in close contact with each other through van der Waals force to form an array.

本实施例中碳源气可选用乙炔等化学性质较活泼的碳氢化合物，保护气体可选用氮气、氨气或惰性气体。In this embodiment, the carbon source gas can be selected from acetylene and other chemically active hydrocarbons, and the protective gas can be selected from nitrogen, ammonia or inert gas.

步骤二：采用一拉伸工具从碳纳米管阵列中拉取获得至少一碳纳米管薄膜。该碳纳米管薄膜的制备具体包括以下步骤：(a)从上述碳纳米管阵列中选定一定宽度的多个碳纳米管片断，本实施例优选为采用具有一定宽度的胶带接触碳纳米管阵列以选定一定宽度的多个碳纳米管束；(b)以一定速度沿基本垂直于碳纳米管阵列生长方向拉伸多个该碳纳米管束，以形成一连续的碳纳米管薄膜。Step 2: Using a stretching tool to pull at least one carbon nanotube film from the carbon nanotube array. The preparation of the carbon nanotube film specifically includes the following steps: (a) selecting a plurality of carbon nanotube segments with a certain width from the above-mentioned carbon nanotube array. In this embodiment, an adhesive tape with a certain width is preferably used to contact the carbon nanotube array. Selecting a plurality of carbon nanotube bundles with a certain width; (b) stretching the plurality of carbon nanotube bundles at a certain speed along a direction substantially perpendicular to the growth direction of the carbon nanotube array to form a continuous carbon nanotube film.

在上述拉伸过程中，该多个碳纳米管束在拉力作用下沿拉伸方向逐渐脱离基底的同时，由于范德华力作用，该选定的多个碳纳米管束分别与其他碳纳米管束首尾相连地连续地被拉出，从而形成一碳纳米管薄膜。该碳纳米管薄膜为择优取向排列的多个碳纳米管束首尾相连形成的具有一定宽度的碳纳米管薄膜。该碳纳米管薄膜中碳纳米管的排列方向基本平行于碳纳米管薄膜的拉伸方向。During the above stretching process, while the plurality of carbon nanotube bundles are gradually detached from the substrate along the stretching direction under the action of tension, due to the van der Waals force, the selected plurality of carbon nanotube bundles are respectively connected end-to-end with other carbon nanotube bundles. Continuously pulled out to form a carbon nanotube film. The carbon nanotube film is a carbon nanotube film with a certain width, which is formed by end-to-end connection of a plurality of carbon nanotube bundles arranged in preferred orientation. The arrangement direction of the carbon nanotubes in the carbon nanotube film is substantially parallel to the stretching direction of the carbon nanotube film.

本实施例中，该碳纳米管薄膜的宽度与碳纳米管阵列所生长的基底的尺寸有关，该碳纳米管薄膜的长度不限，可根据实际需求制得。本实施例中采用4英寸的基底生长超顺排碳纳米管阵列，该碳纳米管薄膜的宽度可为1cm～10cm，该碳纳米管薄膜的厚度为0.01～100微米。In this embodiment, the width of the carbon nanotube film is related to the size of the substrate on which the carbon nanotube array grows. The length of the carbon nanotube film is not limited and can be produced according to actual needs. In this embodiment, a 4-inch substrate is used to grow a super-aligned carbon nanotube array, the width of the carbon nanotube film may be 1 cm to 10 cm, and the thickness of the carbon nanotube film is 0.01 to 100 microns.

步骤三：提供一支撑体，将上述碳纳米管薄膜沿预定方向粘附固定于支撑体，从而得到偏光元件。Step 3: providing a support body, and adhering and fixing the above-mentioned carbon nanotube film to the support body along a predetermined direction, thereby obtaining a polarizing element.

本实施例中，该支撑体可为一方形的金属固定框架，用于固定碳纳米管薄膜，其材质不限，固定框架外的多余的碳纳米管薄膜可直接去除。In this embodiment, the support body can be a square metal fixing frame for fixing the carbon nanotube film, and its material is not limited, and the excess carbon nanotube film outside the fixing frame can be directly removed.

由于本实施例步骤一中提供的超顺排碳纳米管阵列中的碳纳米管非常纯净，且由于碳纳米管本身的比表面积非常大，所以该碳纳米管薄膜本身具有较强的粘性。步骤三中该碳纳米管薄膜可利用其本身的粘性直接粘附于固定框架，使该碳纳米管薄膜的四周通过固定框架固定，该碳纳米管薄膜的中间部分悬空。Since the carbon nanotubes in the super-aligned carbon nanotube array provided in step 1 of this embodiment are very pure, and because the specific surface area of the carbon nanotubes is very large, the carbon nanotube film itself has strong viscosity. In step 3, the carbon nanotube film can be directly adhered to the fixed frame by its own viscosity, so that the surroundings of the carbon nanotube film are fixed by the fixed frame, and the middle part of the carbon nanotube film is suspended.

本实施例中，该支撑体也可为一透明基板。上述第一碳纳米管薄膜可直接黏附于透明基板表面。In this embodiment, the support body can also be a transparent substrate. The above-mentioned first carbon nanotube film can be directly adhered to the surface of the transparent substrate.

本技术领域技术人员应明白，该支撑体的大小可依据实际需求确定，当支撑体的宽度大于上述碳纳米管薄膜的宽度时，可将多个上述碳纳米管薄膜无间隙地并排覆盖并粘附在支撑体上。Those skilled in the art should understand that the size of the support body can be determined according to actual needs. When the width of the support body is greater than the width of the above-mentioned carbon nanotube film, a plurality of the above-mentioned carbon nanotube films can be covered and glued side by side without gaps. attached to the support.

可以理解的是，步骤三中，可将多层碳纳米管薄膜沿相同的方向粘附固定于上述支撑体得到偏光元件。It can be understood that in Step 3, the multi-layer carbon nanotube film can be adhered and fixed on the above-mentioned support along the same direction to obtain a polarizing element.

该多层碳纳米管薄膜之间由于范德华力紧密连接形成稳定的多层碳纳米管薄膜结构。该碳纳米管薄膜的层数不限，具体可依据实际需求制备。The multilayer carbon nanotube films are closely connected due to van der Waals force to form a stable multilayer carbon nanotube film structure. The number of layers of the carbon nanotube film is not limited, and can be prepared according to actual needs.

另外，上述获得的偏光元件可进一步使用有机溶剂处理偏光元件中的碳纳米管薄膜。In addition, the polarizing element obtained above can further use an organic solvent to treat the carbon nanotube thin film in the polarizing element.

可通过试管将有机溶剂滴落在碳纳米管薄膜表面浸润整个碳纳米管薄膜，或者，也可将上述形成有碳纳米管薄膜的固定框架整个浸入盛有有机溶剂的容器中浸润。该有机溶剂为挥发性有机溶剂，如乙醇、甲醇、丙酮、二氯乙烷或氯仿，本实施例中优选采用乙醇。该碳纳米管薄膜经有机溶剂浸润处理后，在挥发性有机溶剂的表面张力的作用下，碳纳米管薄膜中的平行的碳纳米管束会部分聚集，因此，处理后的该碳纳米管薄膜表面体积比小，无粘性，且具有良好的机械强度及韧性。处理后的偏光元件能更方便地应用于宏观领域。The organic solvent can be dripped on the surface of the carbon nanotube film through a test tube to soak the entire carbon nanotube film, or the above-mentioned fixed frame formed with the carbon nanotube film can be completely immersed in a container filled with an organic solvent for soaking. The organic solvent is a volatile organic solvent, such as ethanol, methanol, acetone, dichloroethane or chloroform, and ethanol is preferably used in this embodiment. After the carbon nanotube film is infiltrated with an organic solvent, under the effect of the surface tension of the volatile organic solvent, the parallel carbon nanotube bundles in the carbon nanotube film will be partially aggregated. Therefore, the treated carbon nanotube film surface Small volume ratio, no viscosity, and good mechanical strength and toughness. The processed polarizing element can be more conveniently applied to the macro field.

请参阅图3及图4，为本发明实施例偏光元件使用有机溶剂处理前后的扫描电子显微镜照片(SEM)对比示意图。偏光元件的碳纳米管薄膜中碳纳米管均定向排列，相邻碳纳米管薄膜之间通过范德华力结合。进一步地，将上述获得的偏光元件中的碳纳米管薄膜使用有机溶剂处理后，在表面张力的作用下，处理后的该碳纳米管薄膜中的碳纳米管聚集成束。处理后的该碳纳米管薄膜表面体积比小，无粘性，且具有良好的机械强度及韧性，因此能更方便地应用于宏观领域。Please refer to FIG. 3 and FIG. 4 , which are comparison diagrams of scanning electron micrographs (SEM) before and after the polarizing element of the embodiment of the present invention is treated with an organic solvent. The carbon nanotubes in the carbon nanotube film of the polarizing element are all oriented, and the adjacent carbon nanotube films are combined by van der Waals force. Further, after the carbon nanotube film in the polarizing element obtained above is treated with an organic solvent, the carbon nanotubes in the treated carbon nanotube film are aggregated into bundles under the action of surface tension. The treated carbon nanotube film has a small surface volume ratio, no stickiness, and good mechanical strength and toughness, so it can be more conveniently applied to the macroscopic field.

请参阅图5，本发明偏光元件分别采用2层、5层、10层、20层和30层碳纳米管薄膜作为偏振膜，由于碳纳米管对于各种波长的电磁波均有均一的吸收特性，故本发明的偏光元件对于各种波长的电磁波也有均一的偏振吸收性能。同时，从图5中可明显看出，当碳纳米管薄膜层数较少时，该偏光元件在紫外波段会有较好的偏振性能，当偏光元件中碳纳米管薄膜的层数越多，偏光元件的偏振度越高，可在各个波段均具有良好的偏振性能。Please refer to Fig. 5, the polarizing element of the present invention respectively adopts 2 layers, 5 layers, 10 layers, 20 layers and 30 layers of carbon nanotube films as the polarizing film, because carbon nanotubes have uniform absorption characteristics for electromagnetic waves of various wavelengths, Therefore, the polarizing element of the present invention also has uniform polarization absorption performance for electromagnetic waves of various wavelengths. At the same time, it can be clearly seen from Figure 5 that when the number of carbon nanotube film layers is small, the polarizing element will have better polarization performance in the ultraviolet band. When the number of carbon nanotube film layers in the polarizing element is more, The higher the degree of polarization of the polarizing element, the better the polarization performance in each wavelength band.

另外，本领域技术人员还可在本发明精神内做其他变化，当然，这些依据本发明精神所做的变化，都应包含在本发明所要求保护的范围之内。In addition, those skilled in the art can also make other changes within the spirit of the present invention. Of course, these changes made according to the spirit of the present invention should be included within the scope of protection claimed by the present invention.

Claims (10)

1. polarization element, it comprises that a supporter and is arranged at the light polarizing film of this supporter, it is characterized in that: described light polarizing film is that one deck carbon nano-tube film or the multilayer carbon nanotube films that piles up are formed, the continuous films structure of described carbon nano-tube film for being formed to be arranged of preferred orient by Van der Waals force by a plurality of end to end carbon nano-tube bundles, the width of this carbon nano-tube film is 1 centimetre to 10 centimetres.

2. polarization element as claimed in claim 1, it is characterized in that, when this light polarizing film is that multilayer carbon nanotube films piles up when constituting, carbon nano-tube bundle in this multilayer carbon nanotube films aligns substantially in the same direction, closely is connected to form stable multilayer carbon nanotube films structure owing to Van der Waals force between the multilayer carbon nanotube films.

3. polarization element as claimed in claim 2 is characterized in that, the number of plies of this carbon nano-tube film is greater than 10 layers.

4. polarization element as claimed in claim 1 is characterized in that, the thickness of described carbon nano-tube film is 0.01～100 micron.

5. polarization element as claimed in claim 1 is characterized in that, described carbon nano-tube film is a plurality of by the membrane structure of the end to end carbon nano-tube bundle of Van der Waals force to be arranged of preferred orient and to form.

6. polarization element as claimed in claim 1 is characterized in that, described supporter is fixed frame or transparency carrier.

7. polarization element as claimed in claim 6, it is characterized in that described supporter is fixed frame, the viscosity of described carbon nano-tube film utilization one's duty directly adheres to fixed frame, make fixing by fixed frame of this carbon nano-tube film all around, the center section of this carbon nano-tube film is unsettled.

8. preparation method who prepares polarization element as claimed in claim 1, it may further comprise the steps:

One carbon nano pipe array is provided, and the preparation method of above-mentioned carbon nano pipe array may further comprise the steps:

One smooth substrate is provided;

Evenly form a catalyst layer at substrate surface;

The above-mentioned substrate that is formed with catalyst layer was annealed in 700～900 ℃ air 30 minutes 90 minutes; And

The substrate of handling is placed reacting furnace, be heated to 500～740 ℃ under the blanket gas environment, fed the carbon source solid/liquid/gas reactions then 5～30 minutes, it highly is 200～400 microns carbon nano pipe array that growth obtains;

Adopt a stretching tool to pull from carbon nano pipe array and obtain one deck carbon nano-tube film at least, the preparation of this carbon nano-tube film specifically may further comprise the steps:

A plurality of carbon nano-tube bundles of selected certain width from above-mentioned carbon nano pipe array;

Be basically perpendicular to these a plurality of carbon nano-tube bundles of carbon nano pipe array direction of growth stretching with the certain speed edge, to form a continuous carbon nano-tube film;

One supporter is provided, and the described carbon nano-tube film of one deck is adhered fixed in supporter along predetermined direction at least, thereby obtains polarization element.

9. polarization element, it comprises that a supporter and is arranged at the light polarizing film of this supporter, it is characterized in that, described light polarizing film is that 20 or 30 layers of carbon nano-tube film pile up formation is set, carbon nano-tube film in described 20 or 30 layers of carbon nano-tube film is a plurality of continuous films structures that formed to be arranged of preferred orient by the end to end carbon nano-tube bundle of Van der Waals force, and the width of this carbon nano-tube film is 1 centimetre to 10 centimetres.

10. polarization element, it comprises that a supporter and is arranged at the light polarizing film of this supporter, it is characterized in that, described light polarizing film is that a plurality of carbon nano-tube films do not have the gap side by side and are covered on the described supporter, the width of described supporter is greater than the width of described carbon nano-tube film, each carbon nano-tube film in described a plurality of carbon nano-tube film is for being 1 centimetre to 10 centimetres continuous films structure by a plurality of carbon nano-tube bundles by the join end to end width that forms of Van der Waals force, and described a plurality of carbon nano-tube bundles are arranged of preferred orient.

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