Department of Chemical Engineering and Materials Science, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA.
Langmuir. 2012 Sep 18;28(37):13467-72. doi: 10.1021/la301775d. Epub 2012 Sep 4.
Graphene electrode was fabricated by inkjet printing, as a new means of directly writing and micropatterning the electrode onto flexible polymeric materials. Graphene oxide sheets were dispersed in water and subsequently reduced using an infrared heat lamp at a temperature of ~200 °C in 10 min. Spacing between adjacent ink droplets and the number of printing layers were used to tailor the electrode's electrical sheet resistance as low as 0.3 MΩ/□ and optical transparency as high as 86%. The graphene electrode was found to be stable under mechanical flexing and behave as a negative temperature coefficient (NTC) material, exhibiting rapid electrical resistance decrease with temperature increase. Temperature sensitivity of the graphene electrode was similar to that of conventional NTC materials, but with faster response time by an order of magnitude. This finding suggests the potential use of the inkjet-printed graphene electrode as a writable, very thin, mechanically flexible, and transparent temperature sensor.
通过喷墨打印技术制备了石墨烯电极，这是一种将电极直接书写和微图案化到柔性聚合物材料上的新方法。氧化石墨烯薄片在水中分散，然后使用红外热灯在~200°C 的温度下在 10 分钟内还原。通过调整相邻墨滴之间的间隔和打印层数，可以将电极的电阻降低到低至 0.3 MΩ/□，透光率高达 86%。研究发现，石墨烯电极在机械弯曲下稳定，并表现为负温度系数（NTC）材料，其电阻随温度升高迅速下降。石墨烯电极的温度灵敏度与传统 NTC 材料相似，但响应时间快一个数量级。这一发现表明，喷墨打印石墨烯电极有望成为一种可书写、极薄、机械灵活且透明的温度传感器。
