Coated surface acoustic wave sensor employing a reversible mass-amplifying ligand substitution reaction for real-time measurement of 1,3-butadiene at low- and sub-ppm concentrations.
Coated surface acoustic wave sensor employing a reversible mass-amplifying ligand substitution reaction for real-time measurement of 1,3-butadiene at low- and sub-ppm concentrations.
复制标题
涂层表面声波传感器采用可逆质量放大配体取代反应，实时测量低 ppm 和亚 ppm 浓度的 1,3-丁二烯。
DOI：
10.1021/ac00058a008
复制
发表时间：
1993
影响因子：
7.4
通讯作者：
Zellers,ET
中科院分区：
文献类型：
--
作者：
Zhang,GZ;Zellers,ET
本文介绍了一种涂有铂（Ⅱ）-烯烃配合物PtCl_2-（1-己烯）（吡啶）及其配合物的声表面波（SAW）传感器对1，3-丁二烯气体的实时测量。传感器响应的放大是由每个丁二烯分子置换两个1-己烯分子和形成桥接络合物[PtCl 2（吡啶）] 2（1，3-丁二烯）引起的。在30兆赫声表面波振荡器上，频率变化率与丁二烯空气浓度在150至> 13 ppm范围内呈线性关系，计算检出限为101 ppb。使用60 MHz振荡器，检测限降低到24 ppb。相对湿度从5%到80%的变化或温度从25 ℃到35 ℃的变化对传感器响应没有影响。未观察到几种工业相关非烯烃有机气体和蒸气的干扰。对几种烯烃都有响应，但它们只在较高的相对浓度下干扰丁二烯的响应。该试剂可以通过短暂暴露于1-己烯蒸气而重复再生，在随后的暴露时保留原始响应特性。根据最近提出的2 ppm的职业接触限值，讨论了使用该传感器监测职业1，3-丁二烯接触的可能性。
Real-time measurement of 1, 3-butadiene gas using a surface acoustic wave (SAW) sensor coated with the square-planar Pt (II)-olefin-complex PtCl2-(1-hexene)(pyridine) and related complexesis described. Amplification of the sensor response results from displacement of two 1-hexene molecules by each butadiene molecule and formation of the bridged complex [PtCl2 (pyridine)] 2 (1, 3-butadiene). Using a 30-MHz SAW oscillator, the rate of frequency changeis linearly related to the butadiene air concentration from 150 ppb to> 13 ppm and a calculated detection limit of 101 ppb is obtained. Using a 60-MHz oscillator, the detection limit is reduced to 24 ppb. No effect on the sensor response is observed with changes in relative humidity from 5 to 80% or changes in temperature from 25 to 35 C. No interference is observed from several industrially relevant non-olefin organic gases and vapors. Responses are obtained for several olefins, but they interfere with the re-sponse to butadiene only at higher relative con-centrations. The reagent can be regenerated repeatedly by brief exposure to 1-hexene vapor with retention of the original response characteristics upon subsequent exposure. The potential for using this sensor to monitor occupational 1, 3-butadiene exposures isdiscussed in light of the recently proposed occupational exposure limit of 2 ppm.