Single electron transfer-driven multi-dimensional signal read-out function of TCNQ as an ``off-the-shelf'' detector for cyanide

Ajayakumar, MR and Mandal, Kalyanashis and Rawat, Kamla and Asthana, Deepak and Pandey, Ravindra and Sharma, Akanksha and Yadav, Sarita and Ghosh, Subhasis and Mukhopadhyay, Pritam (2013) Single electron transfer-driven multi-dimensional signal read-out function of TCNQ as an ``off-the-shelf'' detector for cyanide. In: ACS Applied Materials & Interfaces, 5 (15). pp. 6996-7000.

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Abstract

Herein we report the first applications of TCNQ as a rapid and highly sensitive off-the-shelf cyanide detector. As a proof-of-concept, we have applied a kinetically selective single-electron transfer (SET) from cyanide to deep-lying LUMO orbitals of TCNQ to generate a persistently stable radical anion (TCNQ(center dot-)), under ambient condition. In contrast to the known cyanide sensors that operate with limited signal outputs, TCNQ(center dot-) offers a unique multiple signaling platform. The signal readability is facilitated through multichannel absorption in the UV-vis-NIR region and scattering-based spectroscopic methods like Raman spectroscopy and hyper Rayleigh scattering techniques. Particularly notable is the application of the intense 840 nm NIR absorption band to detect cyanide. This can be useful for avoiding background interference in the UV-vis region predominant in biological samples. We also demonstrate the fabrication of a practical electronic device with TCNQ as a detector. The device generates multiorder enhancement in current with cyanide because of the formation of the conductive TCNQ(center dot-).

Item Type:	Journal Article
Publication:	ACS Applied Materials & Interfaces
Publisher:	American Chemical Society
Additional Information:	Copyright of this article belongs to American Chemical Society.
Keywords:	Single Electron Transfer; Radical Anion; Signal Read-Out; TCNQ; Cyanide; Off the-Shelf Detector
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	23 Sep 2013 08:33
Last Modified:	23 Sep 2013 08:33
URI:	http://eprints.iisc.ac.in/id/eprint/47397

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