Detection of organic compounds based on surface photovoltage inversion of functionalized silicon nanowires
Source abstract
Abstract
This study aims to provide a qualitative understanding of organic surface modification`s effect on silicon nanowires` charge transport mechanisms. The effects of surface binding have been characterized using complementary techniques. Fourier transform infrared spectroscopy (FTIR) is a powerful protocol to study the functionalization of hydrogen-terminated boron-doped SiNWs with 3-amino propyl triethoxy silane (APTES), resulting in amino-terminated SiNWs. Surface photovoltage (SPV) correlated with Hall effect measurements shows that functionalized SiNWs recognize volatile organic compounds (VOCs) with appreciable sensitivity by changing the conductivity type from p to n. SPV exhibits a conductivity inversion phenomenon during VOC adsorption, generated by surface states, appropriate behaviour for transport properties. The analysis of the measurements led to significant results through the modulation of the surface potential and the inversion of the conductivity during the adsorption of VOCs, which improve the efficiency of charge transfer between the sensors based on SiNWs and VOC targets, providing a powerful approach for sensing applications. SPV results open a new opportunity of application for diagnosing the performance of SiNWs-based sensors.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Nanowire Synthesis and Applications · Analytical Chemistry and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (35)
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