Detection of 2,4-dinitrotoluene using hydrogen-bond acidic polymer coated SAW sensor  

作　　者：Yang Wang Xiaosong Du Yin Long Huiling Tai Yadong Jiang 

机构地区：[1]State Key Laboratory of Electronic Thin Films and Integrated Devices,School of Optoelectronic Information,University of Electronic Science and Technology of China

出　　处：《Chinese Science Bulletin》2014年第21期2608-2612,共5页

基　　金：supported by the National High Technology Research & Development Program of China (2014AA063010);the Specialized Research Fund for the Doctoral Program of Higher Education (20130185110017);the National Natural Science Foundation of China (61176066 and 61101031)

摘　　要：A strong hydrogen-bond acidic(HBA)polymer linear fluoroalcoholic polysiloxane(PLF),synthesized by one-step hydrosilylation,was introduced for 2,4-dinitrotoluene(2,4-DNT)detection using surface acoustic wave(SAW)devices.FT-IR spectra and1H NMR spectra characterizations confirmed its molecular structure.Then,PLF was dissolved in chloroform,and spray coated onto a434 MHz SAW device.And subsequently,the sensitivity and selectivity of the fabricated sensor were studied based on a SAW test platform.To 2,4-DNT of 1 ppm and 100 ppb(for DNT,1 ppm=8.1 mg/m3;1 ppb=8.1 lg/m3),the responses of the sensor rose 7.7 and 1.5 kHz,respectively.Furthermore,compared with some common interference vapors at 10 mg/m3,the response of the sensor to 2,4-DNT at1 ppm was 5 times stronger.The sensitive property was attributed to the hydrogen bond interaction between the hexafluoroisopropanol(HFIP)group in PLF and the basic lone electron pairs of nitro-groups in 2,4-DNT.Comparison between the PLF sensor and hydroxyl group functionalized polymer(carbowax and MOBCD)-coated sensors was investigated,and the results showed that the PLF sensor exhibited better sensitivity.In a word,the PLF sensor exhibited fast response,negligible baseline drifts and excellent reversibility,indicating good candidates of HFIP group functionalized HBA polymers for practical nitroaromatic explosives detection.A strong hydrogen-bond acidic （HBA） polymer linear fluoroalcoholic polysiloxane （PLF）, synthesized by one-step hydrosilylation, was introduced for 2,4-dinitrotoluene （2,4-DNT） detection using surface acoustic wave （SAW） devices. FT-IR spectra and 1H NMR spectra char- acterizations confirmed its molecular structure. Then, PLF was dissolved in chloroform, and spray coated onto a 434 MHz SAW device. And subsequently, the sensitivity and selectivity of the fabricated sensor were studied based on a SAW test platform. To 2,4-DNT of 1 ppm and 100 ppb （for DNT, 1 ppm = 8.1 mg/m3; 1 ppb = 8.1 ;tg/m3）, the responses of the sensor rose 7.7 and 1.5 kHz, respectively. Furthermore, compared with some common interference vapors at 10 mg/m3, the response of the sensor to 2,4-DNT at 1 ppm was 5 times stronger. The sensitive property was attributed to the hydrogen bond interaction between the hexafluoroisopropanol （HFIP） group in PLF and the basic lone electron pairs of nitro-groups in 2,4-DNT. Comparison between the PLF sensor and hydroxyl group functionalized polymer （carbowax and MOBCD）-coated sensors was investigated, and the results showed that the PLF sensor exhibited better sensitivity. In a word, the PLF sensor exhibited fast response, negligible baseline drifts and excellent reversibility, indicating good candidates of HFIP group functionalized HBA polymers for practical nitroaromatic explosives detection.

关 键 词：传感器检测 氢键相互作用 酸性聚合物 SAW器件 二硝基甲苯 FT-IR光谱 涂覆 核磁共振氢谱 

分 类 号：O657[理学—分析化学] TP212[理学—化学]