TY - JOUR
T1 - Dual-Gated Transistor Platform for On-Site Detection of Lead Ions at Trace Levels
AU - Venkatesh, Shishir
AU - Li, Tan
AU - Wang, Xiang Sheng
AU - Yeung, Chi Chung
AU - Pei, Ke
AU - Sun, Qi Jun
AU - Wu, Wei
AU - Li, Robert K.Y.
AU - Lam, Michael H.W.
AU - Chan, Paddy K.L.
AU - Wylie, Jonathan J.
AU - Roy, Vellaisamy A.L.
N1 - Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/6/19
Y1 - 2018/6/19
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85049008282&partnerID=8YFLogxK
U2 - 10.1021/acs.analchem.8b00841
DO - 10.1021/acs.analchem.8b00841
M3 - Article
C2 - 29812910
AN - SCOPUS:85049008282
SN - 0003-2700
VL - 90
SP - 7399
EP - 7405
JO - Analytical Chemistry
JF - Analytical Chemistry
IS - 12
ER -