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分别以聚乙烯吡咯烷酮(PVP)和溴酚蓝(BPB)掺杂的PVP溶液作为敏感材料,用旋转甩涂法制备薄膜固定在K+交换玻璃光波导表面,研制出PVP薄膜/K+交换玻璃光波导敏感元件和BPB-PVP复合薄膜/K+交换玻璃光波导敏感元件并研究其气敏性.选择最佳条件制备的PVP薄膜/K+交换玻璃光波导敏感元件对二甲苯气体的响应较大(1×10-3—1×10-6(v0/v));PVP中掺杂不同浓度的溴酚蓝,确定其最佳浓度制备的BPB-PVP复合薄膜/K+交换玻璃光波导敏感元件,能检测体积比浓度为1×10-8(S/N=2.9)的二甲苯气体,且体积比浓度在1×10-3—1×10-8(v0/v)范围内输出光强度的变化与二甲苯气体浓度之间有良好的线性关系(R2=0.98).
PVP films doped with polyvinylpyrrolidone (PVP) and bromophenol blue (BPB) were respectively used as sensitive materials. The films were fixed on the surface of optical waveguide of K + exchange glass by spin-coating method. PVP film / K + exchange glass optical waveguide Sensitive element and BPB-PVP composite film / K + exchange glass optical waveguide sensing element and to study the gas sensitivity.Select the optimal conditions of the PVP film / K + exchange glass optical waveguide sensor response to xylene gas larger (1 × 10-3-1 × 10-6 (v0 / v)); PVP doped with different concentrations of bromophenol blue, to determine the optimal concentration of BPB-PVP composite film / K + exchange glass optical waveguide sensor can detect Xylene gas having a volume concentration of 1 × 10 -8 (S / N = 2.9), and the change of the output light intensity in the range of 1 × 10 -3 to 1 × 10 -8 (v 0 / v) There is a good linear relationship between xylene gas concentrations (R2 = 0.98).