Percolation Phenomena in Silicon - Based Nanocrystalline Systems

Lepadatu, Ana-Maria; Rusnac, E.; Stavarache, Ionel

doi:10.1109/smicnd.2007.4519789

Cited by 2 publications

(1 citation statement)

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“…The nonohmic behavior in the IV characteristics of a single Ni-Si NW is in contrast to the Ni-Si NW network shown in Figure 3 b. This difference in the IV characteristics of these two devices can be explained by the percolation theory, which predicts a threshold areal NW density for the onset of ohmic characteristics from nonohmic behavior for metal/semiconductor shell/core nanostructures [ 29 , 30 ]. The single Ni-Si NW-based device was heat-treated by rapid thermal annealing (RTA) process at 300°C for 20 min to reduce contact resistance.…”

Section: Resultsmentioning

confidence: 99%

Real-time detection of chlorine gas using Ni/Si shell/core nanowires

et al. 2015

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We demonstrate the selective adsorption of Ni/Si shell/core nanowires (Ni-Si NWs) with a Ni outer shell and a Si inner core on molecularly patterned substrates and their application to sensors for the detection of chlorine gas, a toxic halogen gas. The molecularly patterned substrates consisted of polar SiO2 regions and nonpolar regions of self-assembled monolayers of octadecyltrichlorosilane (OTS). The NWs showed selective adsorption on the polar SiO2 regions, avoiding assembly on the nonpolar OTS regions. Utilizing these assembled Ni-Si NWs, we demonstrate a sensor for the detection of chlorine gas. The utilization of Ni-Si NWs resulted in a much larger sensor response of approximately 23% to 5 ppm of chlorine gas compared to bare Ni NWs, due to the increased surface-to-volume ratio of the Ni-Si shell/core structure. We expect that our sensor will be utilized in the future for the real-time detection of halogen gases including chlorine with high sensitivity and fast response.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-015-0729-2) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%