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Ultrasensitive detection of explosives via hydrophobic condensation effect biomimetic SERS platforms

Abstract

3D biomimetic superhydrophobic Ag micron/nano-pillar arrays (AMA) surface as the SERS substrates were prepared for the ultrasensitive and reproducible detection of explosives picric acid (PA), 3-Nitro-1, 2, 4-triazol-5-one (NTO) by the simple, efficient, and inexpensive hydrophobic condensation strategy. We took advantage of different kinds of Si pillar arrays (cicada wings topographical biomimetic structure) as templates for the electrochemical deposition generation of 3D AMA. From a macro and micro perspective, we studied the effects of biomimetic superhydrophobicity and different AMA micro-morphology on the SERS performance, respectively. For the first time, simple hydrophilic organic synthesis process also conducted to improve the poor water-solubility of toxins and helped them be detected. Such SERS sensors exhibited high sensitivity to rhodamine 6G (R6G) at a low concentration of 10-15 mol/L, and to PA at a low concentration of 10-12 mol/L, NTO as low as 10-13 mol/L after hydrophilic synthesis. This method of hydrophobic condensation substrates resolved the problems for limited organic solutions of toxins in difficulty to SERS detection. Furthermore, it is highly useful to improve the practical applications in portable Raman detecting devices to detect low solubility protonic toxins.

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Publication details

The article was received on 22 Sep 2017, accepted on 05 Nov 2017 and first published on 08 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC04325B
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Ultrasensitive detection of explosives via hydrophobic condensation effect biomimetic SERS platforms

    X. He, Y. liu, X. Xue, J. Liu, Y. Liu and Z. Li, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC04325B

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