纳米Sm2O3催化发光检测异丁醇气体传感器的研究

A study on detection of isobutanol gas sensor utilizing cataluminescence on nano-Sm2O3

以纳米Sm2O3为传感器元件,设计构建了检测异丁醇的催化发光传感器。该传感器对异丁醇具有选择性好、响应速度快、运行成本低等优点。在检测波长为440 nm,工作温度为187℃,载气流速为70 mL/min条件下,正丁醇、乙醇、甲醇、甲醛、氨气、苯和乙苯经过此传感器时,仅正丁醇产生弱的发光信号,是异丁醇的3.4%,其它气体不产生催化发光响应信号。在0.50~20.0 mg/L浓度范围内,催化发光信号强度与异丁醇浓度呈良好的线性关系(r=0.99982),检出限(S/N=3)为0.15 mg/L。将此传感器用于实际样品中异丁醇的测定,4个样品中异丁醇回收率为90.5%~99.4%,相对标准偏差(RSD)为0.38%~4.7%,表明该传感器可用于分析实际样品中的异丁醇。

In the present paper,a nanosized Sm2O3 was developed as a sensor element,and it was designed and constructed as a cataluminescence(CTL)sensor for detection of isobutanol.The sensor has the advantages of good selectivity,fast response and low operating costs for isobutanol.At a detection wavelength of 440 nm,working temperature of 187℃,and flow rate of 70 mL/min,while n-butanol,ethanol,methanol,formaldehyde,ammonia,benzene and ethylbenzene were investigated using the nanosized Sm2O3 sensor,only n-butanol produced weak CTL signal,which was 3.4%of isobutanol.Other gases could not produce CTL response signals.There was a good linear relationship between the CTL intensity and isobutanol concentration in the range of 0.50~20.0 mg/L,with a correlation coefficient of 0.99982 and a limit of detection(signal-to-noise ratio,S/N=3)of 0.15 mg/L.The developed sensor was used in the spiked analysis of the real samples containing isobutanol,the recoveries(90.5%~99.4%)were obtained with the relative standard deviation(n=5)of 0.38%~4.7%.Which demonstrated that the sensor can be applicated to analyze isobutanol in real samples.