摘要
研究了空气中的乙醚蒸气在纳米材料表面的催化化学发光现象,发现ZnO纳米棒对乙醚的检测具有较高的灵敏度和选择性,据此设计了检测乙醚蒸气的传感器.该传感器在波长460 nm,温度264℃和载气流速280 mL.min-1的最佳条件下,化学发光强度与乙醚蒸气浓度在10~2 000 mL.m-3内呈良好的线性关系(R=0.999 6),检出限为4.8 mL.m-3,响应时间为2 s.在可能共存的10种干扰物中,只有乙醛、乙酸和丙酮分别引起1.38%、1.06%和1.31%的干扰,苯、甲醛、氨水、甲醇、七氟醚、乙醇和三氯甲烷等7种蒸气则没有引起干扰.应用该传感器可方便、快速地测定空气中的低浓度乙醚蒸气.
A sensor for detecting ethyl ether in air was designed based on the cataluminescence phenomenon when ethyl ether vapor was passing through the surface of the ZnO nano-rods. The proposed sensor showed high sensitiv- ity and selectivity to ethyl ether at optimal temperature of 264 ℃, a wavelength of 460 nm and a flow rate of 280 mL · min -l. The linear range of CTL intensity versus concentrations of ethyl ether vapor was 10 mL · m -3 · 2 000 mL· m-3 (R = 0. 999 6), with detection limits of 4.8 mL · m-3 and the response time was within 2 s. There was no response to common foreign substances, such as benzene, formaldehyde, ammonia, methanol, sevoflurane, ethanol and chloroform,while only acetaldehyde, acetic acid and acetone could cause 1.38%, 1.06%, 1.31% of interference respectively. Ethyl ether vapor could be measured conveniently and quickly by this gas sensor.
出处
《广州大学学报(自然科学版)》
CAS
2010年第4期28-32,共5页
Journal of Guangzhou University:Natural Science Edition
基金
国家自然科学基金项目(20677013)
广东省自然科学基金项目(8151009101000130)资助