穆张岩,周雪龙,范铮,付超群,淡振华,常辉.纳米多孔银的制备及其甲醛高效检测[J].稀有金属材料与工程,2019,48(10):3252~3257.[MU Zhangyan,ZHOU Xuelong,FAN Zheng,FU Chaoqun,DAN Zhenhua,Hui Chang.Fabrication of nanoporous silver and its superior sensitivities to formaldehyde[J].Rare Metal Materials and Engineering,2019,48(10):3252~3257.]
纳米多孔银的制备及其甲醛高效检测
投稿时间:2018-04-08  修订日期:2018-05-08
中文关键词:  脱合金法  纳米多孔银  甲醛检测  循环伏安法
基金项目:江苏省自然科学基金BK20151536;江苏省大学生创新创业训练计划201710291048Z
中文摘要:
      纳米多孔银因其比表面积大且活性位点密度高等特性,在甲醛高效检测领域有潜在应用。本研究在0.1 mol?L-1盐酸溶液中对Ag30Zn70合金通过化学脱合金和电化学脱合金法两种方法制备纳米多孔银,研究化学脱合金时间和电化学脱合金电压对纳米多孔银孔结构的影响以及多孔结构的甲醛检测灵敏度和有效检测范围。结果表明,在自然浸泡24小时过程中,金属间化合物ε相中Zn发生缓慢选择溶解,形成纳米多孔Ag及残存ε相的共存结构,通过化学脱合金难以制备出Ag相占比高的纳米多孔结构。通过电化学脱合金方式施加电压0.1 V极化6000 s后,可制备出孔径约80 nm的三维连续贯通的纳米多孔银结构。循环伏安测定结果表明,在0.1 mol?L-1 KOH基液中,甲醛氧化电流密度随着甲醛浓度的增加而增大,氧化电流密度与甲醛浓度在10~100 mmol?L-1范围内呈良好的线性关系,甲醛检测灵敏度为0.1。纳米多孔银在50~100 mmol?L-1的高浓度范围表现出优异的甲醛检测性能。
Fabrication of nanoporous silver and its superior sensitivities to formaldehyde
英文关键词:dealloying  nanoporous silver  formaldehyde detection  cyclic voltammetry
英文摘要:
      Nanoporous silver owning to large specific surface area and high densities of active sites, has a great potential for superior formaldehyde detection. Both chemical dealloying and electrochemical dealloying of Ag30Zn70 precursor alloy in 0.1 mol?L-1 hydrochloric acid solution were employed to fabricate NPS. The effects of duration time of chemical dealloying and applied potential of electrochemical dealloying on the formation of nanoporous structure and the current response of formaldehyde have been investigated. The results show that slow selective dissolution of Zn elements in intermetallic ε phase takes place during chemical dealloying of 24 h, which leads to the formation of nanoporous structure consisting of Ag and residual ε phase. Through electrochemical dealloying with applied potential of 0.1 V for 6000 s, 3D bi-continuous NPS with characteristic pore size of 80 nm was achieved. The results of cyclic voltammetry show that the oxidation current density of formaldehyde was enhanced with the increasing of formaldehyde concentration in 0.1 mol?L-1 KOH solution. The response oxidation current densities linearly depended on formaldehyde concentrations between 10~100 mmol/L, and the sensitivity of formaldehyde detection was 0.10. The present reagents of nanoporous silver had superior formaldehyde detection abilities in high concentrations of 50~100 mmol?L-1.
作者单位E-mail
穆张岩 南京工业大学 材料科学与工程学院 南京 210009 15951600109@163.com 
周雪龙 南京工业大学 材料科学与工程学院 南京 210009 heronz@163.com 
范铮 南京工业大学 材料科学与工程学院 南京 210009 rgfanzheng@163.com 
付超群 南京工业大学 材料科学与工程学院 南京 210009 840350217@njtech.edu.cn 
淡振华 南京工业大学 材料科学与工程学院 南京 210009 zhenhuadan@njtech.edu.cn 
常辉 南京工业大学 材料科学与工程学院 南京 210009 ch2006@njtech.edu.cn 
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