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Electrospray-printed nanostructured graphene oxide gas sensors

机译：电喷雾纳米结构氧化石墨烯气体传感器

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摘要

We report low-cost conductometric gas sensors that use an ultrathin film made of graphene oxide (GO) nanoflakes as transducing element. The devices were fabricated by lift-off metallization and near-room temperature, atmospheric pressure electrospray printing using a shadow mask. The sensors are sensitive to reactive gases at room temperature without requiring any post heat treatment, harsh chemical reduction, or doping with metal nanoparticles. The sensors' response to humidity at atmospheric pressure tracks that of a commercial sensor, and is linear with changes in humidity in the 10%-60% relative humidity range while consuming <6 mu W. Devices with GO layers printed by different deposition recipes yielded nearly identical response characteristics, suggesting that intrinsic properties of the film control the sensing mechanism. The gas sensors successfully detected ammonia at concentrations down to 500 ppm (absolute partial pressure of similar to 5 x 10(-4) T) at similar to 1 T pressure, room temperature conditions. The sensor technology can be used in a great variety of applications including air conditioning and sensing of reactive gas species in vacuum lines and abatement systems.
机译：我们报告了低成本的电导式气体传感器，该传感器使用由氧化石墨烯（GO）纳米薄片制成的超薄膜作为传感元件。这些器件是通过剥离金属化和使用荫罩在接近室温的大气压电喷雾印刷来制造的。传感器对室温下的反应性气体敏感，无需任何后热处理，苛刻的化学还原或掺杂金属纳米颗粒。传感器在大气压下对湿度的响应与商用传感器相同，并且在10％-60％相对湿度范围内随湿度变化呈线性关系，而消耗的功率却小于6μW。采用不同沉积配方印刷GO层的器件产生了几乎相同的响应特性，表明胶片的内在特性控制着传感机制。气体传感器在室温条件下以1 T的压力成功检测到浓度低至500 ppm（绝对分压，类似于5 x 10（-4）T）的氨。传感器技术可用于多种应用，包括空调以及在真空管线和减排系统中检测反应性气体种类。

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