纳米金-聚二甲基硅氧烷复合薄膜制备及电学特性研究

Study on preparation and characteristics of AuNPs-PDMS composite membrane

纳米金-聚二甲基硅氧烷(AuNPs-PDMS)复合微薄膜具有良好的生物适应性和较高的灵敏度,可作为生物传感器的敏感元件。通过两步还原法制得的AuNPs-PDMS复合微薄膜,具有良好的导电性和柔韧性。通过温度、形变、膜厚对复合薄膜导电性影响进行测试研究,结果表明转速为1000r/min时,复合薄膜电阻最小,为7.3Ω;在施加3kPa气压时,复合薄膜表现出半导体特性,最大电阻变化率为0.022%;复合薄膜的电阻随温度的升高而增大,符合线性关系。

AuNPs-PDMS composite membranes can be used as a sensitive element of biosensor because of its biocompatibility and high sensitivity. AuNPs-PDMS composite membranes which had good conductivity and flexibility were fabricated with two-step reduction. The effect of temperature,deformation and thickness on the conductivity was tested repectively. And its results showed that the films had the minimum resistance of 7. 3Ω when the rotational speed was 1000r/min. When the pressure was 3k Pa and voltage was 50 mV,the films suddenly became larger and exhibited the semiconductor properties. The maximum resistance change rate was 0. 022%. With increasing the temperature,the membrane resistance also increased and conformed to the linear relation.