Abstract

The 7,7,8,8-tetracyanoquinodimethane (TCNQ) radical anion salt compound was used as the sensitive material of gas point contact sensors. The phase composition and surface morphology of the obtained sensor films were established. It was found correlation between surface morphology of the point-contact transducer and definite type of the sensor response curve observed under action of the human breath gas. If the sensor sample is formed from numerical crystals of the same or similar sizes having a uniform shape, similar to a shell, and clearly defined external borders it indicates to the creation of defect-free Yanson point contacts in the process of soft electrochemical synthesis. As a result, the surface of the sensor is a complex multistructure of a numerous number of Yanson point contacts, which generates a large output signal from the sensor in response to the action of the analyte. When crystals of Cu-TCNQ compound forming samples under investigation have lower density, large size, distorted and full of fractures boundaries, it prevents the formation of high-quality point contacts. These morphologic peculiarities are typical for samples with low level of response signal. In the case of extremely low density of Cu-TCNQ crystals observed in the sample surface the sample does not show any response to the action of the human breath gas.

摘要

7,7,8,8-四氰基醌二甲烷（TCNQ）自由基阴离子盐化合物被用作气体点接触传感器的敏感材料。确定了所获得的传感器薄膜的相组成和表面形貌。发现点接触换能器的表面形态与在人体呼吸气体作用下观察到的传感器响应曲线的确定类型之间存在相关性。如果传感器样品由相同或相似尺寸的数字晶体形成，具有统一的形状，类似于壳，并具有明确定义的外部边界，则表明在软电化学合成过程中产生了无缺陷的延森点接触。因此，传感器的表面是一个由无数个Yanson点接触组成的复杂的多重结构，其响应分析物的作用从传感器产生大的输出信号。当研究中的 Cu-TCNQ 化合物形成样品的晶体密度较低、尺寸较大、扭曲且充满断裂边界时，会阻止高质量点接触的形成。这些形态特征对于具有低响应信号水平的样品来说是典型的。在样品表面观察到的 Cu-TCNQ 晶体密度极低的情况下，样品对人体呼吸气体的作用没有任何反应。这些形态特征对于具有低响应信号水平的样品来说是典型的。在样品表面观察到的 Cu-TCNQ 晶体密度极低的情况下，样品对人体呼吸气体的作用没有任何反应。这些形态特征对于具有低响应信号水平的样品来说是典型的。在样品表面观察到的 Cu-TCNQ 晶体密度极低的情况下，样品对人体呼吸气体的作用没有任何反应。