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Nanostructure and Morphology Modified Porous Silicon Sensors

机译:纳米结构和形态修饰的多孔硅传感器

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The ability to control and transform the morphology and optical properties of porous silicon (PS) interface arrays canhave important implications for displays and sensors. .The optoelectronic properties and interaction sensing capabilitiesof PS can be varied as a function of pore size and pore morphology as dictated by the manipulation of a surfacestructure which can be controlled with current density, the solution composition of the electrochemical etches used toprepare the pores, and careful post etch surface treatments. These treatments influence the time dependentphotoluminescence (PL) emission from PS. The variation of surface structure as it effects the PL from these PS porearrays is outlined and discussed within the framework of detailed molecular electronic structure calculations whichmodel the excited state structure giving rise to the UV-visible PL emission from PS. Applications varying from displaysto sensors to micro-reactors will be considered. Porous silicon interfaces have also been transformed within theframework of nanotechnology to create highly efficient sensors displaying a rapid, reversible, sensitive, and selectiveresponse to HCl, NH3, CO, and NO down to the ppb level. Photoluminescence induced metallization is used to obtain ahighly efficient, <20Ω, electrical contact to the sensor, allowing operation at a bias voltage of 1-10mV. Theintroduction of gold and tin-based nanostructures to a micro/nanoporous PS array selectively modifies its impedanceresponse to considerably improve the detection of the NH3, CO, and NO. Through FFT analysis, a gas response can beacquired and filtered on a drifting baseline, further improving sensitivity. New nanoscale exclusive techniques havebeen developed for the rapid formation of highly efficient TiO_2-xNx nanophotocatalysts, operative and tunablethroughout the visible wavelength region, to be used in conjunction with porous silicon hybrid nanopore coatedmicropores to form novel and efficient solar pumped sensor arrays.
机译:控制和转换多孔硅(PS)接口阵列的形态和光学特性的能力可能会对显示器和传感器产生重要影响。 PS的光电特性和相互作用感应能力可以根据孔径和孔的形貌而变化,这取决于对表面结构的控制,该结构可以用电流密度,所使用的电化学蚀刻液的溶液组成来顶替孔和仔细的蚀刻后表面处理。这些处理影响了PS的时间依赖性光致发光(PL)发射。在详细的分子电子结构计算的框架内,概述并讨论了表面结构对这些PS孔阵列影响PL的变化,这些分子模型模拟了激发态结构,从而引起了PS的UV-可见PL发射。将考虑从显示器到传感器再到微反应器的各种应用。多孔硅界面也已经在纳米技术的框架内进行了改造,以创建高效的传感器,对ppb级的HCl,NH3,CO和NO表现出快速,可逆,敏感和选择性的响应。光致发光金属化用于获得与传感器的高效电接触,<20Ω,允许在1-10mV的偏置电压下工作。将金和锡基纳米结构引入微孔/纳米孔PS阵列可选择性地修改其阻抗响应,从而显着改善NH3,CO和NO的检测。通过FFT分析,可以获取气体响应并在漂移的基线上进行过滤,从而进一步提高了灵敏度。已经开发出新的纳米级专有技术,用于快速形成在可见光波长范围内可操作和可调的高效TiO_2-xNx纳米光催化剂,与多孔硅杂化纳米孔涂覆的微孔结合使用,以形成新颖而高效的太阳能泵浦传感器阵列。

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