摘要
将纯聚乙烯醇(PVA)和掺有维生素C的PVA作为敏感试剂,通过旋转甩涂法分别研制出了PVA薄膜/锡掺杂玻璃光波导元件和VC-PVA薄膜/锡掺杂玻璃光波导元件并检测其气敏特性.实验结果表明,PVA薄膜/锡掺杂玻璃光波导元件对二甲苯气体有良好的选择性响应,其响应浓度范围为10-4～10-7(体积比);加入VC后,使此敏感元件具有更高的灵敏度,更宽的响应范围即Vc-PVA薄膜/锡掺杂玻璃光波导元件对浓度为10-8的二甲苯气体有很明显的响应.这些气敏元件具有灵敏度高、线性响应范围宽、响应恢复速度快、制作工艺简单等特点.
The optical waveguide（OWG） sensor used consists of a substrate,waveguide layer（K ＋ ion exchanged layer or tin-diffused OWG） and thin top layer（sensing layer）.The semiconductor laser beam（630 ～ 680 nm） was introduced into the OWG using a prism coupler（glass prism,n = 1.78;and a matching liquid,diiodomethane,n = 1.74）,and it emerged from another prism coupler.The intensity of the output light was monitored by using a photomultiplier detector,and the output light intensity was recorded by a computer.Pure air that functioned as a carrier and dilution gas flowed through the cell at a constant rate of 40 mL /min in order to transfer the xylene gas to the sensor.All measurements were made at room temperature.Pure PVA and Vc embedded PVA were chosen as sensitive materialst,he PVA film /tin-diffused glass OWG and VC-PVA thin film /tin-diffused glass OWG were fabricated by spin-coating methods.We used this two OWG sensors to detect xylene gas,and the experimental result shows that the PVA film /tin-diffused glass OWG exhibited a good response to xylene gasi,ts detection range was 10-4 ～ 10-7.While the Vc-PVA thin film /tin-diffused glass OWG exhibited higher sensitivity and larger response range（this OWG sensor has a considerable response to 10-8 of xylene gas）.These sensors were also characterized by high sensitivitys,imple structure and were easily fabricated.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2011年第4期366-370,共5页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号20665004
20965008)资助项目
