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Easy synthesis of organic-inorganic hybrid nanomaterials: study of DC conduction mechanism for light dependent resistors

机译：易于合成有机 - 无机杂交纳米材料：光依赖电阻直流传导机构的研究

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摘要

A surfactant assisted chemical oxidation method has been employed for facial synthesis of polypyrrole/tin oxide (PPy/SnO2) hybrid nanoneedles. The charge transport properties of the prepared hybrid nanomaterials have been analyzed under different conduction mechanisms for their possible application for light dependent resistors (LDRs). The scanning electron microscopy studies revealed that the increased concentration of additive SnO2 quantum dots alters the surface morphology from nanowall-like to nanoneedle-like and the formation of PPy/SnO2 nanocomposites is confirmed X-ray diffraction studies. The strong coupling between the PPy and SnO2 results in the transformation of PPy from highly oxidized states to oxidized states and is confirmed through Raman analysis. The simple band conduction model and Kivelson's power law based conduction mechanism could not be applied to explain the conduction mechanism due to different reasons. The log sigma(dc) curves for all samples were well fitted for gamma = 1/4, suggesting the applicability of Mott's three dimensional variable range hopping VRH model for charge transport. The room temperature dark conductivity of the samples was found to decrease with an increase in SnO2 concentration. The formation of p-n junctions between p-type PPy and n-type SnO2 changes the bandgap of PPy and the work function. This modifies the electronic structure of PPy which brings a synergistic effect in the photosensitivity of the PPy/SnO2 nanocomposites. The room temperature photoresponse of the PPy/SnO2 samples was found to increase from 2.85 to 6.25% at 100 mW cm(-2) illumination intensity with an increase in the SnO2 doping concentration from 0 to 20%.
机译：表面活性剂辅助化学氧化方法已用于面部合成聚吡咯/氧化锡（PPY / SNO2）杂交纳米。在不同的传导机构下分析了制备的杂交纳米材料的电荷传输性质，以便他们可能施加光依赖性电阻器（LDR）。扫描电子显微镜研究表明，增加的添加剂SnO2量子点的浓度提高了从纳米槽状到纳米罩状的表面形态，并且确认了PPY / SnO2纳米复合材料的形成。X射线衍射研究。 PPY和SnO2之间的强耦合导致从高氧化状态转化为氧化状态，并通过拉曼分析证实。简单的乐队传导模型和基于Kivelson的电力定律的传导机制无法应用于引起导致的导通机制。所有样品的Log Sigma（DC）曲线适用于Gamma = 1/4，表明Mott的三维可变范围跳频VRH模型用于电荷运输的适用性。发现样品的室温暗导率随着SNO2浓度的增加而降低。 P型PPY和N型SnO2之间的P-N结的形成改变了PPY的带隙和功函数。这改变了PPY的电子结构，其在PPY / SNO2纳米复合材料的光敏性中为具有协同作用。发现PPY / SnO2样品的室温光响应从100mW cm（-2）照明强度的2.85％增加到6.25％，随着SnO2掺杂浓度的增加，0％至20％。

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  • 来源
    《RSC Advances》 |2016年第37期|共11页
  • 作者

    Rawal Ishpal; Tripathi Ravi Kant; Panwar O. S.;

  • 作者单位

    Univ Delhi Kirori Mal Coll Dept Phys Delhi 110007 India;

    Natl Phys Lab CSIR Phys Energy Harvesting Div Polymorph Carbon Thin Films Grp Dr KS Krishnan Rd New Delhi 110012 India;

    Natl Phys Lab CSIR Phys Energy Harvesting Div Polymorph Carbon Thin Films Grp Dr KS Krishnan Rd New Delhi 110012 India;

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  • 正文语种 eng
  • 中图分类 化学;
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