Inkjet-Printed Silver Nanoparticle Paper Detects Airborne Species from Crystalline Explosives and Their Ultratrace Residues in Open Environment

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• 作者：Jianping Wang ; Liang Yang ; Bianhua Liu ; Haihe Jiang ; Renyong Liu ; Jingwei Yang ; Guangmei Han ; Qingsong Mei ; Zhongping Zhang
• 刊名：Analytical Chemistry
• 出版年：2014
• 出版时间：April 1, 2014
• 年：2014
• 卷：86
• 期：7
• 页码：3338-3345
• 全文大小：479K
• 年卷期：v.86,no.7(April 1, 2014)
• ISSN：1520-6882

文摘

An electronic nose can detect highly volatile chemicals in foods, drugs, and environments, but it is still very much a challenge to detect the odors from crystalline compounds (e.g., solid explosives) with a low vapor pressure using the present chemosensing techniques in such way as a dog鈥檚 olfactory system can do. Here, we inkjet printed silver nanoparticles (AgNPs) on cellulose paper and established a Raman spectroscopic approach to detect the odors of explosive trinitrotoluene (TNT) crystals and residues in the open environment. The layer-by-layer printed AgNP paper was modified with p-aminobenzenethiol (PABT) for efficiently collecting airborne TNT via a charge-transfer reaction and for greatly enhancing the Raman scattering of PABT by multiple spectral resonances. Thus, a Raman switch concept by the Raman readout of PABT for the detection of TNT was proposed. The AgNPs paper at different sites exhibited a highly uniform sensitivity to TNT due to the layer-by-layer printing, and the sensitive limit could reach 1.6 脳 10^鈥?7 g/cm² TNT. Experimentally, upon applying a beam of near-infrared low-energy laser to slightly heat (but not destruct) TNT crystals, the resulting airborne TNT in the open environment was probed at the height of 5 cm, in which the concentration of airborne species was lower than 10 ppt by a theoretical analysis. Similarly, the odors from 1.4 ppm TNT in soil and 7.2, 2.9, and 5.7 ng/cm² TNT on clothing, leather, and envelope, respectively, were also quickly sensed for 2 s without destoying these inspected objects.