Colorimetric detection of lead (Pb +2 ) by gold nanoclusture embedded disposable paper analytical device B.N. Kumara 1 , M.H Naveen 2 ,Jin Ho Bang 2 ,L. Sripathy 3 ,K.S. Prasad 1* 1 Nanomaterial Research Deralakatte, Mangalore-5, Laboratory (NMRL), Nano Division, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangaluru, 2 Department of Chemical and Molecular Engineering, Hanyang University, Republic of Korea, 3 Department of Chemistry, Vivekananda Degree College, Bangalore *ksprasadnair@yenepoya.edu.in Exposure to very low levels of Pb 2+ leads to chronic health problems, and the source for Pb 2+ could be from water, soil, and industrial exposure. Great efforts have been devoted to develop various kinds of Pb 2+ sensors, among these fluorescent and colorimetric sensors are of great interest. Considering the significance of Pb 2+ detection, a cost-effective point-of-use sensor platform is the need of the hour. Moreover, the sensor platform should obey WHOs ASSURED criteria (affordable, sensitive, specific, user-friendly, rapid and robust, equipment- free, and deliverable to end-users), and also it should imply the simple Do It Yourself (DIY) strategy. By keeping this in mind, herein we developed thiol protected gold nanocluster (Au18) based paper analytical device (PAD) for sensitive detection of Pb 2+ through simple colorimetric technique by exploiting the photoluminescent properties of Au18. The selective detection of Pb 2+ could observe with the color changes by naked eye, and under UV exposure of PAD. The as-developed point-of-use paper device could detect selectively ppm levels of Pb 2+ and suffered no interference from other metal ions. Further, the established rapid and on-spot detection strategy can be improved in agriculture/environmental soil and water toxicity monitoring applications. References 1. Yu Y, Chen X, Yao Q, Yu Y, Yan N, Xie J. Scalable and precise synthesis of thiolated Au10–12, Au15, Au18, and Au25 nanoclusters via pH controlled CO reduction. Chemistry of Materials. 2013 Mar 26;25(6):946-52. 2. Abbas MA, Kim TY, Lee SU, Kang YS, Bang JH. Exploring interfacial events in gold-nanocluster-sensitized solar cells: insights into the effects of the cluster size and electrolyte on solar cell performance. Journal of the American Chemical Society. 2016 Jan 13;138(1):390-401.
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