Fundamental Studies of Nanocrystalline Silicon Hybrids

在这个由化学部的化学测量和成像计划资助的项目中，纽约的州立大学的布法罗大学的Frank V.Bright教授正在开发用于检测和量化各种分子的无试剂光学传感器。为了应对这一挑战，开发了新的化学物质来修饰固有光致发光纳米晶材料的表面，以赋予化学选择性。目标分子选择性地结合到新的表面化学，导致纳米晶体材料光致发光（强度，颜色）的浓度依赖性变化。这项工作通过可能生产新的探测器和传感器产生广泛的影响。它通过一个针对妇女和代表性不足的少数民族的培训计划，对下一代科学家产生了进一步的广泛影响。此外，该团队正在与他们大学的退伍军人服务办公室合作，鼓励军事人员参与研究，以促进他们向STEM相关职业的过渡。这项研究的重点是使用多孔硅（pSi）和独立的硅纳米晶体（SiNC）作为新的传感器的基础。该研究同时利用表面接枝硅烷，硅氢化和MOx化学（选择性分析物分区/相互作用，提高稳定性）和硅纳米级架构（光电发射，取决于nanocomplallite表面化学）的独特物理学的有吸引力的方面，以开发用于检测和定量各种分析物的无试剂光学传感器。研究目的包括：（i）建立化学反应以在纳米晶硅表面产生空间独特的分析物响应性材料;（ii）阐明表面化学反应和空间依赖性组成梯度的影响以优化分析物选择性和分析信号;以及（iii）将这些平台技术扩展到各种各样的目标分析物。主要的研究工具包括稳态和时间分辨光致发光（PL），多光谱PL和红外（IR）成像，红外光谱，原子力显微镜（AFM），扫描开尔文探针显微镜（SKPM），共焦拉曼显微镜和光谱，共定位AFM/SKPM和拉曼成像，和尖端增强拉曼散射（TERS）成像和映射。

In this project funded by the Chemical Measurement and Imaging program of the Chemistry Division, Professor Frank V. Bright of the University at Buffalo, The State University of New York is developing reagent free optical sensors for detecting and quantifying a wide variety of molecules. To meet this challenge, new chemistries are developed to modify the surface of intrinsically photoluminescent nanocrystalline materials to impart chemical selectivity. The target molecules are selectively bound to the new surface chemistry, leading to a concentration-dependent change in the nanocrystalline material photoluminescence (intensity, color). The work is having a broad impact through the potential production of new detectors and sensors. It is having a further broad impact on the next generation of scientists through a training program that targets women and underrepresented minorities. In addition, the team is partnering with their university's Veterans Services office to encourage the participation of military personnel in the research in order to facilitate their transition into STEM-related careers. This research is focused on the use of porous silicon (pSi) and free-standing Si nanocrystals (SiNCs) as the basis for new sensors. The research simultaneously exploits the attractive aspects of surface-grafted silane, hydrosilation, and MOx chemistries (selective analyte partitioning/interaction, improved stability) and the unique photophysics of silicon nanoscale architectures (photoemission that depends on the nanocrystallite surface chemistry) to develop reagentless optical sensors for detecting and quantifying a wide variety of analytes. The research aims include: (i) establishing chemistries to create spatially unique, analyte-responsive materials at nanocrystalline silicon surfaces; (ii) elucidating the effects of surface chemistry and spatially-dependent compositional gradients to optimize analyte selectivity and analytical signals; and (iii) extending these platform technologies to a wide variety of target analytes. The primary research tools used include steady-state and time-resolved photoluminescence (PL), multispectral PL and infrared (IR) imaging, IR spectroscopy, atomic force microscopy (AFM), scanning Kelvin probe microscopy (SKPM), confocal Raman microscopy and spectroscopy, co-localized AFM/SKPM and Raman imaging, and tip enhanced Raman scattering (TERS) imaging and mapping.