Department of Chemical Engineering, Pohang University of Science and Technology, San 31 Namgu Hyojadong, Pohang, Republic of Korea.
Anal Chem. 2012 Oct 2;84(19):8179-83. doi: 10.1021/ac3013785. Epub 2012 Sep 12.
A novel quartz resonator was developed to measure, simultaneously, changes in the mass and electrical resistance of a polyaniline film during the absorption of water vapor. Interdigitated gold electrodes were vacuum-deposited on the sensing surfaces of the quartz crystals, and polyaniline films were drop-cast on the electrodes used to measure the changes in the electrical resistance. Two symmetric semicircular gold electrodes were deposited on the bottom surface of the quartz crystal. These electrodes were used to measure the changes in the mass of absorbed water based on the changes in the resonance frequency. The simultaneous measurements of mass and electrical resistance shed light on the interactions between the water vapor and the polyaniline film. The resonator was exposed to various organic gases, including ethanol, acetone, or chloroform, and each gas was found to produce characteristic changes in the normalized electrical resistance.
研制了一种新型石英谐振器，以同时测量聚乙炔薄膜在吸收水蒸气过程中质量和电阻的变化。叉指状金电极被真空沉积在石英晶体的传感表面上，并且聚苯胺薄膜被滴铸在用于测量电阻变化的电极上。两个对称的半圆形金电极被沉积在石英晶体的底表面上。这些电极用于基于共振频率的变化来测量吸收水的质量变化。质量和电阻的同时测量揭示了水蒸气和聚乙炔薄膜之间的相互作用。该谐振器被暴露于各种有机气体，包括乙醇、丙酮或三氯甲烷，并且发现每种气体都在归一化电阻中产生特征变化。
