摘要
采用微接触印刷法在普通玻璃基底表面制备具有微沟槽结构的功能性有机膜,通过自组装法组装活性位点,采用铜网固定液晶膜制备成了新型的液晶化学传感器。研究结果表明,当传感器用于检测有机磷农药时,液晶分子E7由垂直排列状态向平行排列状态转变,液晶膜的颜色和亮度发生了改变;对常见有机磷农药,其最低检测限达到0.051 g/m3以下;重复检测0.114 g/m3的DDVP时可达50次以上;同时该传感器也表现出良好的抗干扰性及温度适用性,证实该种传感器对环境中有机磷农药的检测具有潜在的应用前景。
A novel liquid crystal（LC）based chemical sensor was prepared as follows：the sensitive films on ordinary glass slides were deposited by microcontact printing method and then modified using active locus,the copper grids were placed on sensitive films to fit liquid crystal（E7）films.The experimental results show that E7 molecule underwent transition from a homeotropic orientation to a planar one upon exposure to organophosphate pesticides vapor;the minimum detection limit response to common organophosphate pesticides reached 0.051 g/m3;the sensors could detect 0.114 g/m3 of DDVP over 50 times.Furthermore,this kind of sensor exhibited high selectivity and thermal adaptability,demonstrating the feasibility of using these devices in the detection and identification of positive organophosphate pesticides in environment.
出处
《传感技术学报》
CAS
CSCD
北大核心
2011年第10期1386-1390,共5页
Chinese Journal of Sensors and Actuators
基金
国防科研基金项目
关键词
传感器
液晶
微接触印刷法
有机磷
sensor
liquid crystal
microcontact printing
Organophosphate
