Dual-Gated Transistor Platform for On-Site Detection of Lead Ions at Trace Levels

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)7399-7405
Journal / PublicationAnalytical Chemistry
Volume90
Issue number12
Online published29 May 2018
Publication statusPublished - 19 Jun 2018

Abstract

On-site monitoring of heavy metals in drinking water has become crucial because of several high profile instances of contamination. Presently, reliable techniques for trace level heavy metal detection are mostly laboratory based, while the detection limits of contemporary field-based methods are barely meeting the exposure limits set by regulatory bodies such as the World Health Organization (WHO). Here, we show an on-site deployable, Pb2+ sensor on a dual-gated transistor platform whose lower detection limit is 2 orders of magnitude better than the traditional sensor and 1 order of magnitude lower than the exposure limit set by WHO. The enhanced sensitivity of our design is verified by numerically solving PNP (Planck–Nernst–Poisson) model. We demonstrate that the enhanced sensitivity is due to the suppression of ionic flux. The simplicity and the robustness of the design make it applicable for on-site screening, thereby facilitating rapid response to contamination events.

Citation Format(s)

Dual-Gated Transistor Platform for On-Site Detection of Lead Ions at Trace Levels. / Venkatesh, Shishir; Li, Tan; Wang, Xiang-Sheng et al.

In: Analytical Chemistry, Vol. 90, No. 12, 19.06.2018, p. 7399-7405.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review