Kavli Nanoscience Institute, California Institute of Technology, MS 114-36, Pasadena, California 91125.
Department of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125.
Nano Lett. 2010 Oct 13;10(10):3899-903. doi: 10.1021/nl101586s.
Miniaturized gas chromatography (GC) systems can provide fast, quantitative analysis of chemical vapors in an ultrasmall package. We describe a chemical sensor technology based on resonant nanoelectromechanical systems (NEMS) mass detectors that provides the speed, sensitivity, specificity, and size required by the microscale GC paradigm. Such NEMS sensors have demonstrated detection of subparts per billion (ppb) concentrations of a phosphonate analyte. By combining two channels of NEMS detection with an ultrafast GC front-end, chromatographic analysis of 13 chemicals was performed within a 5 s time window.
微型化气相色谱(GC)系统可以在超小的封装中提供快速、定量的化学蒸气分析。我们描述了一种基于谐振纳机电系统(NEMS)质量探测器的化学传感器技术,该技术提供了微尺度 GC 范例所需的速度、灵敏度、特异性和尺寸。这种 NEMS 传感器已经证明可以检测到十亿分之几(ppb)浓度的膦酸酯分析物。通过将两个 NEMS 检测通道与超快 GC 前端相结合,在 5 秒的时间窗口内对 13 种化学物质进行了色谱分析。