Enhanced sensitivity of SAW gas sensor coated molecularly imprinted polymer incorporating high frequency stability oscillator
作者： Wang Wen , He Shitang , Li Shunzhou , Liu Minghua , Pan Yong
DOI: 10.1016/J.SNB.2007.02.037
关键词: Cyclic voltammetry 、 Molecularly imprinted polymer 、 Materials science 、 Single-mode optical fiber 、 Analytical chemistry 、 Optoelectronics 、 Electrode 、 Transducer 、 Insertion loss 、 Surface acoustic wave 、 Frequency response 、 Instrumentation (computer programming) 、 Electrical and Electronic Engineering 、 Materials Chemistry 、 Electronic, Optical and Magnetic Materials 、 Surfaces, Coatings and Films 、 Condensed matter physics 、 Metals and Alloys
摘要: Abstract This paper presents a 300 MHz surface acoustic wave (SAW) gas sensor coated molecularly imprinted polymer incorporating novel SAW oscillator with high frequency stability. A delay line on ST-X quartz substrate low insertion loss (less than 12 dB) and single mode selection capability was fabricated as the element. Electrode width control phase unidirectional transducer (EWC/SPUDT) configuration comb were used to structure device minimize accomplish selection, respectively. Prior fabrication, coupling of modes (COM) simulation performed predict performance. The measured response S 12 showed good agreement simulated results. effect circuit system temperature shift upon stability studied in detail. Typical short-term (1 h) ∼0.06 ppm (∼20 Hz) for observed laboratory environment control. successfully applied 10 nm (MIP) material dimethyl-methyl-phosphonate (DMMP), MIP prepared using o -phenylenediamine ( -PD) functional monomer, Sarin acid molecular template co-polymerized cyclic voltammetry (CV). sensitivity DMMP concentrations detection range 1–100 mg/m 3 evaluated ∼96 Hz/mg/m , threshold limit up 0.5 mg/m .
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