Amine basicity (pKb) controls the analyte binding energy on single walled carbon nanotube electronic sensor arrays

Journal of the American Chemical Society
Chang Young Lee, Michael S Strano

Abstract

A wide range of analytes adsorb irreversibly to the surfaces of single walled carbon nanotube electronic networks typically used as sensors or thin-film transistors, although to date, the mechanism is not understood. Using thionyl chloride as a model electron-withdrawing adsorbate, we show that reversible adsorption sites can be created on the nanotube array via noncovalent functionalization with amine-terminated molecules of pKa < 8.8. A nanotube network comprising single, largely unbundled nanotubes, near the electronic percolation threshold is required for the effective conversion to a reversibly binding array. By examining 11 types of amine-containing molecules, we show that analyte adsorption is largely affected by the basicity (pKb) of surface groups. The binding energy of the analyte is apparently reduced by its adsorption on the surface chemical groups instead of directly on the SWNT array itself. This mediated adsorption mechanism is supported by X-ray photoelectron spectroscopy (XPS) and molecular potential calculations. Reversible detection with no active regeneration at the parts-per-trillion level is demonstrated for the first time by creating a higher adsorption site density with a polymer amine, such as polyethyl...Continue Reading

References

Aug 9, 2003·Physical Review Letters·Wei Shi, J Karl Johnson
Aug 10, 2006·Nano Letters·Joshua A RobinsonF Keith Perkins
Aug 28, 2006·Nanotechnology·Kyle CattanachSanjeev K Manohar

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Citations

Sep 9, 2011·Chemical Reviews·Radislav A PotyrailoAndrew Burns
Jul 8, 2014·Nature Communications·Girish S KulkarniXudong Fan
Mar 5, 2016·The Journal of Chemical Physics·M A Martin-DrumelA Cuisset
Aug 20, 2008·Nanotechnology·Ting ZhangMarc A Deshusses
Jul 22, 2010·Nanoscale·Gaëlle CharronTalal Mallah
Jun 8, 2011·Talanta·Vincent Lau Chun FaiByeong-Kwon Ju
Jun 2, 2009·Journal of the American Chemical Society·Wei ZhangTimothy M Swager
Jul 8, 2010·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Donna J NelsonParamasivan T Perumal
Jun 30, 2010·Journal of the American Chemical Society·Rosa ArrigoDang Sheng Su
Sep 19, 2018·Chemical Reviews·Vera SchroederTimothy M Swager

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