Nanostructure-directed physisorption vs chemisorption at semiconductor interfaces: the inverse of the HSAB concept

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
James L Gole, Serdar Ozdemir

Abstract

A concept, complementary to that of hard and soft acid-base interactions (HSAB-dominant chemisorption) and consistent with dominant physisorption to a semiconductor interface, is presented. We create a matrix of sensitivities and interactions with several basic gases. The concept, based on the reversible interaction of hard-acid surfaces with soft bases, hard-base surfaces with soft acids, or vice versa, corresponds 1) to the inverse of the HSAB concept and 2) to the selection of a combination of semiconductor interface and analyte materials, which can be used to direct a physisorbed vs chemisorbed interaction. The technology, implemented on nanopore coated porous silicon micropores, results in the coupling of acid-base chemistry with the depletion or enhancement of majority carriers in an extrinsic semiconductor. Using the inverse-HSAB (IHSAB) concept, significant and predictable changes in interface sensitivity for a variety of gases can be implemented. Nanostructured metal oxide particle depositions provide selectivity and complement a highly efficient electrical contact to a porous silicon nanopore covered microporous interface. The application of small quantities (much less than a monolayer) of nanostructured metals, metal...Continue Reading

References

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Citations

Feb 13, 2013·Beilstein Journal of Nanotechnology·James L Gole, William Laminack
Jan 4, 2012·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·James L GoleWilliam Laminack
May 28, 2014·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·William I Laminack, James L Gole
Jun 14, 2019·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Alexey V GarshevValeriy V Krivetskiy

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