Gas sensor applications of porous Si layers

Mizsei, J.

doi:10.1016/j.tsf.2007.03.033

Cited by 62 publications

(29 citation statements)

References 47 publications

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“…It was found from the literature that Pd modification is very effective to reduce the operating temperature and to achieve a high response of a gas sensor. Depending on the factors like grain size, porosity and the thickness of the thin film, porous silicon can appreciably be used as a gas sensor operating at low temperature (Mizsei, 2007). Improved gas response behaviour of a palladium doped porous silicon based hydrogen sensor was reported by Polishchuk et al (Polishchuk et al 1998).…”

Section: Effect Of Noble Metal Dispersion On the Surface Of Porous Simentioning

confidence: 99%

Nanocrystalline Porous Silicon

Basu¹,

Kanungo²

2011

Crystalline Silicon - Properties and Uses

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Section: Effect Of Noble Metal Dispersion On the Surface Of Porous Simentioning

confidence: 99%

Nanocrystalline Porous Silicon

Basu¹,

Kanungo²

2011

Crystalline Silicon - Properties and Uses

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“…These different forms of PSi have distinctly different physical properties, and their characteristics may vary during ageing due to oxidation and hydroxylation processes. [48] With this in mind, we examine the Si L 2,3 XES spectra of LPSi and HPSi. As shown in Figure 2, the Si L 2,3 XES spectrum of LPSi is almost the same as that of bulk crystalline Si (c-Si), whereas the Si L 2,3 XES spectrum of HPSi is the almost same as the spectrum of SiO 2 .…”

Section: Resultsmentioning

confidence: 99%

Selective Response of Mesoporous Silicon to Adsorbants with Nitro Groups

McLeod¹,

Kurmaev²,

Sushko³

et al. 2012

Chemistry A European J

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We demonstrate that the electronic structure of mesoporous silicon is affected by adsorption of nitro-based explosive molecules in a compoundselective manner. This selective response is demonstrated by probing the adsorption of two nitro-based molecular explosives (trinitrotoluene and cyclotrimethylenetrinitramine) and a nonexplosive nitro-based aromatic molecule (nitrotoluene) on mesoporous silicon using soft X-ray spectroscopy. The Si atoms strongly interact with adsorbed molecules to form Si-O and Si-N bonds, as evident from the large shifts in emission energy present in the Si L2,3 X-ray emission spectroscopy (XES) measurements. Furthermore, we find that the energy gap of mesoporous silicon changes depending on the adsorbant, as estimated from the Si L2,3 XES and 2p Xray absorption spectroscopy (XAS) measurements. Our ab initio molecular dynamics calculations of model compounds suggest that these changes are due to spontaneous breaking of the nitro groups upon contacting surface Si atoms. This compound-selective change in electronic structure may provide a powerful tool for the detection and identification of trace quantities of airborne explosive molecules.

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“…Films made of porous silicon have found their own application in sensor technologies (Mizsei 2007 ; ). Here we will concentrate on the properties of silicon nanocrystals, which can be presented as a new version of quantum dots.…”

Section: Porous Silicon and Silicon Nanoparticlesmentioning

confidence: 99%

Nanoscale Fluorescence Emitters

Demchenko

2015

Introduction to Fluorescence Sensing

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This chapter provides comparative analysis of properties of different nanoscale materials to absorb and emit visual and near-IR light with the focus on their applications in sensing and imaging technologies. Nowadays we observe that in these applications the novel nanoscale fl uorescent materials appear in strong competition with traditional organic dyes. They demonstrate diverse photophysical behavior and allow obtaining diverse information when they are incorporated into sensor composites or form the images in biological systems. Among these nanoscale emitters are the structures formed of organic dyes or by these dyes incorporated into different types of polymers with the resulting dramatically increased brightness. Collective excitonic effects appear when the aromatic units are coupled in conjugated polymers. Nanoscale structures formed of inorganic carbon in the form of nanodiamonds, graphene and graphene oxide pieces and the so-called carbon dots joined quite recently the family of fl uorophores. Semiconductor quantum dots present a range of bright emitters covering whole visible and near-IR spectral range. Finally, the up-converting nanocrystals make possible visible emission with near-IR excitation. Here we overview the most important features of these nanoscale materials. The following Chap. 6 will be focused on functional nanocomposites that allow extending the useful properties of these basic components.

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Gas sensor applications of porous Si layers

Cited by 62 publications

References 47 publications

Nanocrystalline Porous Silicon

Nanocrystalline Porous Silicon

Selective Response of Mesoporous Silicon to Adsorbants with Nitro Groups

Nanoscale Fluorescence Emitters

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