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有机磺酸掺杂聚苯胺的光电性能 总被引:2,自引:0,他引:2
对十二烷基苯磺酸( D B S A) 掺杂的聚苯胺进行了光电性能测试,结果表明: D B S A 掺杂的聚苯胺在光照射下,光生载流子明显增大;感光材料的加入有利于聚苯胺在可见光区的吸收,并增加其导电性。对 Al- P An - D B S A- Al 结构的介电弛豫研究表明,在 D B S A 掺杂聚苯胺的薄膜中存在空间电荷极化现象。通过理论计算与测试得知,掺杂态聚苯胺的寿命为微秒级, 迁移率为1 ×10 - 3 ~1 ×10 - 1 cm 2/( V·s) 。从聚苯胺的电导率与温度关系中得到该材料的活化能,并分析了掺杂态聚苯胺的导电机理。 相似文献
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以苯胺为单体,过硫酸铵为氧化剂,采用化学氧化聚合法分别在十二烷基苯磺酸(DBSA)和盐酸中合成了聚苯胺(PAn),并用傅里叶红外光谱和TGA-DTA技术对聚苯胺掺杂前后的结构变化和热稳定性进行了分析。研究了不同质子酸掺杂对聚苯胺气敏性能的影响。结果表明:十二烷基苯磺酸掺杂的聚苯胺,比普通盐酸掺杂的聚苯胺对目标气体具有更好的灵敏性。当r(S:N)为0.4~0.5时,在室温下其对1000×10-6NH3的灵敏度达到了10.43,响应时间为30s,恢复时间为3min。且与盐酸相比,十二烷基苯磺酸掺杂的聚苯胺具有更好的环境稳定性。 相似文献
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硼掺杂及未掺杂金刚石薄膜的电学和光电导特性 总被引:1,自引:1,他引:1
用热丝辅助化学气相沉积法合成了未掺杂及B掺杂金刚石薄膜,测量了退火前后的电流一电压和光电导特性.实验结果表明,H原子对未掺杂金刚石膜的电学和光电导特性有很大影响.对于掺杂样品,随着B含量的增高,B的作用更加明显,而H的作用降低.合成的金刚石膜中存在着各种缺陷态,其中包含陷阶型缺陷态,它影响着光电导饱和值的大小和弛豫时间的长短.经600℃退火后,样品的结构、缺陷态的种类、数量都发生变化,并改变了金刚石膜的电学及光电导特性. 相似文献
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对AlGaN基p-i-n光电探测器的负光电响应特性进行研究,从实验上证实了器件中p型接触电极的肖特基特性是导致该现象的主导因素.不同偏压下的响应光谱表明,这些AlGaN光伏器件中存在较为明显的光导响应特性.光照和暗背景条件下的C-f曲线验证了器件中的持续光电导特性,而高铝组分铝镓氮材料内存在的大量缺陷被认为是该现象的起因.系统地研究了AlGaN基p-i-n光电探测器存在的负响应现象及其微观机理,为铝镓氮基日盲器件光电性能的优化提供了重要参考依据. 相似文献
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采用电化学方法,利用有机染料对聚苯胺进行有机染料增感,制备出不同增感性能的聚苯胺薄膜。采用红外吸收光谱对增感后的聚苯胺的结构和性能进行了表征,对其在紫外- 可见光区的吸收特性进行了研究。结果表明,染料增感后的聚合物薄膜电导率分别为:直接耐晒蓝增感为0 .142 S/cm ;直接耐晒翠蓝增感为1 .050 S/cm ;直接耐晒黑增感为0 .796 S/cm ; 四羧基酞菁增感为1 .220 S/cm 。这些增感均可使聚苯胺在可见光谱范围内的光吸收增强,较大幅度地改善聚苯胺的光谱响应范围,并使得有机染料增感后的聚苯胺薄膜保持很高的电导率 相似文献
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本文研究了光电导聚合物中空间电荷场的建立过程和稳态特性。研究了电荷俘获中心对空间电荷场强度,建立时间以及相移的影响。 相似文献
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掺杂硫酸浓度对聚苯胺膜性能的影响 总被引:7,自引:0,他引:7
采用循环伏安法在镍基底上制得聚苯胺(PAn)膜,研究了硫酸掺杂剂的浓度对PAn膜聚合过程、电致变色性能、微观形貌及结构的影响。结果表明,在参比电压为–0.2~+1.4 V范围内,该膜的颜色可以在黄绿–绿–深蓝间可逆变化;在0.4 mol/L的掺杂H2SO4浓度下聚合反应平稳进行,所得PAn为晶态纳米纤维网结构。过低或过高的酸度下,PAn几何尺寸增大,为非晶态纳米颗粒,其电致变色性能变差。 相似文献
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This study demonstrates that protein adsorption on end‐grafted, zwitterionic poly(sulfobetaine) (pSBMA) thin films depends on the grafting density, molecular weight, and ionic strength. Zwitterionic polymers exhibit ultralow nonspecific fouling (protein adsorption) and excellent biocompatibility. This picture contrasts with a recent report that soluble pSBMA chains bind proteins and alter the protein folding stability. To address this apparent contradiction, the dependence of protein adsorption on the chain grafting parameters is investigated: namely, the grafting density, molecular weight, and ionic strength. Studies compared the adsorption of phosphoglycerate kinase and positively charged lysozyme versus the scaled grafting parameter s/2RF, where s is the distance between grafting sites and RF is the Flory radius. Plots of the adsorbed protein amount versus s/2RF exhibit a bell‐shaped curve, with a maximum near s/2RF ≈ 1 and an amplitude that decreases with ionic strength. This behavior is qualitatively consistent with theoretical models for colloid interactions with weakly attractive, grafted chains. The results confirm that proteins do adsorb to pSBMA thin films, and they suggest an underlying mechanism. Comparisons with polymer models further identify design rules for pSBMA films that effectively repel protein. 相似文献
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Light‐emitting diodes of poly[2‐methoxy‐5‐(2′‐ethyl‐hexyloxy)‐1,4‐phenylenevinylene] (MEH‐PPV) have been fabricated from sodium sulphonated polystyrene (SSPS) ionomer as an electron‐injecting and hole‐blocking material and polyaniline doped with camphor sulphonic acid (PANI‐CSA) as a polymer anode. The presence of PANI in an ITO/PANI/MEH‐PPV/AI device makes little difference to its optical output and quantum efficiency. SSPS shows good electron injection in an ITO/MEH‐PPV/SSPS/AI device. When SSPS ionomer is introduced in an ITO/PANI/MEH‐PPV/SSPS/A1 device, a larger enhancement in optical output is obtained and its quantum efficiency is also enhanced because of its balanced charge injection. The electroluminescent device associated with SSPS ionomer and PANI is a well‐designed structure to improve stability and efficiency. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献