摘要
通过牺牲模板法合成了具有空心结构的纳米金催化剂,并进行了TEM、SEM和XRD等物理表征。把该催化剂作为工作电极的活性物质,以1mol/LKOH为电解质,组装了电流型甲醛气体传感器。在甲醛气体浓度为0～2.23×10-6mol/L范围内对传感器进行了性能测试,传感器响应信号y(A)与气体浓度x(mol/L)线性回归方程为y=16.63x+4.063×10-7,r=0.9989。该传感器灵敏度高于同载量实心金纳米催化剂组装的传感器70%左右,达到了降低贵金属用量的目的。因其具有较快的响应时间、良好的重现性和良好的线性关系等优点,可用于适当浓度范围内的甲醛气体检测。
The gold hollow nanospheres have been synthesized by sacrifice-template method and the obtained sample has been characterized by TEM, SEM and XRD. The amperometric formaldehyde gas sensor was assembled with gold hollow nanospheres as the active electrode material and 1 mol/L KOH solution as electrolyte. The equation of linear regression （y = 16.63x ＋ 4. 063×10^-7, r = 0. 9989）between the oxidation current （y（A） ）and the concentration of formaldehyde （x/（mol/L） ） was obtained at the formaldehyde concentration in the range of 0 to 2.23×10^-6 mol/L. The sensitivity of the sensor with gold hollow nanospheres as active material increased by about 70% compared with the sensor made of nanoparticles which had the same gold-loading in the work electrode, this method exhibits an advantage of decrease in the cost of the noble metal. This kind of sensor shows potential application in formaldehyde gas detection in this range due to its excellent sensitivity, stable response and good linear relationship.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2009年第7期1092-1096,共5页
Chinese Journal of Analytical Chemistry
关键词
气体传感器
电流型
空心结构
甲醛
纳米金
Gas sensor, amperometric type, hollow structure, formaldehyde, nano gold
