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首页> 美国政府科技报告 >High-speed, Temperature Programmable Gas Chromatography Utilizing a Microfabricated Chip with An Improved Carbon Nanotube Stationary Phase.
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High-speed, Temperature Programmable Gas Chromatography Utilizing a Microfabricated Chip with An Improved Carbon Nanotube Stationary Phase.

机译：利用微加工芯片和改进的碳纳米管固定相的高速，温度可编程气相色谱。

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A new growth recipe for producing single-walled carbon nanotubes (SWCNTs) combined with a new bonding technique was implemented in a microfabricated gas chromatography (micro-GC) chip. Specifically, the micro-GC chip contained a 30 cm (length) microfabricated channel with a 50 ?m x 50 ?m square cross-section. A SWCNT stationary phase “mat” was grown on the bottom of the separation channel prior to the chip bonding. Injections onto the micro-GC chip were made using a previously reported high-speed diaphragm valve technique. A FID was used for detection with a high-speed electrometer board. All together, the result was a highly efficiency, temperature programmable (via low thermal mass, rapid on-chip resistive heating) micro-GC chip. In general, the newly designed micro-GC chip can be operated at significantly lower temperature and pressure than our previously reported micro-GC chip, while producing excellent chemical separations with significantly smaller reduced plate heights, h. Scanning electron microscopy (SEM) images show a relatively thin and uniform mat of nanotubes with a thickness of ~ 800 nm inside the channel. The stationary phase was further characterized using Raman spectroscopy. The uniformity of the stationary phase resulted in better separation efficiency and peak symmetry (as compared to our previous report) in the separation of a mixture of five n-alkanes (n-hexane, n-octane, n-nonane, ndecane and n-undecane). The on-chip resistive heater employing a temperature programming rate of 26 °C/s produced a peak capacity of eight within a 1.4 s time window. As a direct consequence of the stationary phase improvement, a ~ 5-fold improvement in reduced plate height, h, relative to our previous report was obser

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