材料期刊网

目的：开发出切实可行的石英毛细管内壁镀金工艺，应用于激光拉曼的气体分析检测中。方法先用石英玻璃片进行镀金工艺研究，经过对羟基化、硅烷化、纳米金颗粒修饰、湿法镀金各步条件参数的确定，获得最佳的镀金工艺方案，再对相关参数进行调整，应用于石英毛细管。将镀金石英毛细管应用于激光拉曼的气体分析测试中，分析其对散射信号的增强效果。结果 NaOH的浓度和毛细管内溶液的流速及时间显著影响纳米金颗粒的吸附沉积。最佳的石英毛细管内壁镀金工艺为：5 mol/L NaOH处理1 minˇAPTMS/IPA烷基化修饰ˇ金溶胶在流速0.8 mL/min下处理4 hˇ含盐酸羟胺的镀金液在流速0.8 mL/min下处理4 h。该工艺制得的内壁镀金毛细管用于气体拉曼测试后，可将空气中N2相对峰值从148 counts(未镀金毛细管)提高至480 counts。结论制备出的镀金石英毛细管可增强激光拉曼检测气体的信号，为进一步实现气体在线拉曼监测奠定基础。

ABSTRACT:Objective To develop feasible gold deposition technology on the inner wall of the quartz capillary, which is used for gas detection and analysis by laser Raman. Methods Gold plating was studied with quartz glass first and an optimal technology was achieved after the determination of condition parameters for hydroxylation, silanization, gold nanoparticles modification and wet plating. Then this process was applied to the quartz capillary after adjustment of relevant parameters. The gilded quartz capillary was used for gas analysis through laser Raman measurements, and the enhancement effect of scattering signals was analyzed. Re-sults The concentration of sodium hydroxide, the flow rate and flow time of solution in the capillary obviously affected the adsorption of gold nanoparticles. The optimal technology for gold plating inside the quartz capillary was as following:5 mol/L NaOH treatment for 1 minˇAPTMS/IPA alkylated modificationˇgold sol process at the flow rate of 0. 8 mL/min for 4 h ˇtreatment with plating liquid containing hydroxylamine hydrochloride for 4 h at the flow rate of 0. 8 mL/min. The gilded capillary was used for gas Raman tests and the relative peak strength of N2 in the air was increased from 148 counts ( without gold plating) to 480 counts. Conclu-sion By the use of gold-deposited quartz capillary, corresponding signals of gas could be effectively enhanced under laser Raman detection, which lays a foundation for the further in-situ Raman analysis of gas.