传感器用AE44合金表面感应熔炼Ag纳米涂层表征及CH2O检测  

Synthesisand CH2O-Detection Behavior of Nanoporous Ag-Coatings: An Experimental Study

作　　者：游雨云[1] 程智君[1] 詹华群 You Yuyun;Cheng Zhijun;Zhan Huaqun(Department of Electronic Engineering,Shangrao Polytechnic,Shangrao 334109,China;College of Communication and Electronics,Jiangxi Normal University of Science and Technology,Nanchang 330000,China)

机构地区：[1]上饶职业技术学院电子工程系,上饶334109 [2]江西科技师范大学通信与电子学院,南昌330000

出　　处：《真空科学与技术学报》2020年第5期448-452,共5页Chinese Journal of Vacuum Science and Technology

基　　金：2018年度江西省教育厅科学技术研究项目(GJJ181448)。

摘　　要：利用感应熔炼方法在传感器用AE44合金表面制备Ag纳米涂层,分析电位和电流参数对涂层性能的影响,并开展CH2O检测电极灵敏度测试分析。研究结果表明:初期阶段溶解电流密度先发生增大再缓慢减小的情况,总体表现为溶解速率的逐渐下降。合金包含了ε相以及Ag两种组织成分。随着电位上升会产生更多团聚的Ag颗粒,在韧带中产生了大量尺寸差异较大的微孔,孔径基本都在240 nm左右。不同电流密度下AE44合金生成了具有均匀分布形态的Ag纳米涂层。经过4.5 mA/cm2电解后形成了100 nm的孔径,形成了比1.5 mA/cm2条件下更大的孔径。电解反应过程可以在表面区域与内部组织中同步进行,Ag纳米涂层可以获得优异催化效果。当甲醛浓度介于10~50 mmol/L的较低浓度下,氧化峰出现于-0.70 V附近;当甲醛浓度增大至75 mmol/L以上,形成了很大的甲醛氧化电流。The nanoporous Ag-coatings were synthesized by induction melting and via electrochemical reactions(in constant voltage/current modes)with Ag-powder and AE44 alloy as raw materials.The influence of the voltage and current on the;porosity and CH2O-detection sensitivity was investigated.The results show that the voltage and current had a major impact.To be specific,the dielectric and Ag phases co-existed in Ag-coating.In constant-V mode,as V increased,agglomeration of Ag-cluster increased and the dissolution-rate decreased because the current density J,though changing in an increase-decrease manner,approached to an increased value.In constant-I mode,as J increased from 1.5 to 4.5 mA/cm2,the average pore-size increased from 80 to 100 nm.As expected,the nanoporous Ag-coatings exhibited excellent CH2O-detection sensitivity.For instance,at a CH2O-concentration in 10~50 mmol/L range,the oxidation peak was about-0.70 V,and a concentration above 75 mmol/L generated large CH2O-oxidation current.

关 键 词：AE44合金 Ag纳米涂层 感应熔炼 性能表征 甲醛检测 

分 类 号：TG146[一般工业技术—材料科学与工程]