基于多孔硅反射谱的农药浓度测量研究

The pesticide concentration measurement based on reflected spectrum of the porous silicon

根据多孔硅内浸入液体后其有效折射率发生变化,使其光致发光反射谱峰位发生变化的特性,提出了一种利用多孔硅Bragg反射镜的反射谱来测量克百威溶液浓度的新方法。阐述了多孔硅Bragg反射镜测量农药浓度的原理,利用脉冲腐蚀法制备了多孔硅Bragg反射镜,对多孔硅反射镜和它在不同浓度的克百威溶液中进行了实验,获取了它们的反射光谱,制作了克百威浓度与反射谱峰位变化的关系曲线。实验表明：多孔硅反射镜在不同浓度的克百威溶液下,反射谱峰位将发生红移变化;当克百威浓度在0~0.1mg/L时,峰位红移量与克百威浓度成线性关系。也表明利用多孔硅反射谱对相关农药进行定量分析是可行的。

Based on the characteristic of the effective index of the porous silicon（PS） will be changed and the reflected peaks of photoluminescence will be shifted when holes in PS are filled with liquid,a new method of measuring the liquid concentration of Carbofuran is introduced using the reflected spectrum of the porous silicon Bragg reflectors（PSBR）.The theory of measuring the pesticide concentration using the reflected spectrum of PSBR is stated,and PSBR is fabricated by means of the pulsed etching method.The reflected spectra of PSBR itself and those of PSBR in the different Carbofuran solution are obtained by the experiments,and the relation curves of Carbofuran concentration and the reflected peaks of PSBR are made.The results show that the reflected peaks of PSBR will be led to red shft when PSBR is dipped in different Carbofuran solution,and the red shft has a linear relationship to Carbofuran concentration in the range of 0~0.1mg/L.As a result,it is feasible to carry out the quantitative analysis of the concerned pesticide by PS.