Aerosol Jet Printing Conductive 3D Microstructures from Graphene Without Post-Processing.
Aerosol Jet Printing Conductive 3D Microstructures from Graphene Without Post-Processing.
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DOI：
10.1002/smll.202305170
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发表时间：
2023-11
期刊：
影响因子：
13.3
通讯作者：
Brittany N Smith;P. Ballentine;James L. Doherty;Ryan Wence;Hansel Alex Hobbie;Nicholas X. Williams;Aaron D Franklin
中科院分区：
文献类型：
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作者：
Brittany N Smith;P. Ballentine;James L. Doherty;Ryan Wence;Hansel Alex Hobbie;Nicholas X. Williams;Aaron D Franklin
三维（3D）石墨烯微结构具有提高高容量电池和超灵敏传感器性能的潜力。人们已经开发了许多技术来创建此类结构;然而，这些方法通常依赖于结构支撑和/或漫长的印后处理，从而增加了成本和复杂性。增材制造技术，如印刷，显示出克服这些挑战的希望。这项研究采用气溶胶喷射打印，使用水作为唯一的溶剂来创建3D石墨烯微结构，并且不需要任何打印后处理。石墨烯柱在印刷后立即表现出导电性，不需要高温退火。此外，这些支柱成功地以相对于基底的45°以下的角度以独立配置打印，展示了它们对定制应用的适应性。当将石墨烯柱添加到湿度传感器时，额外的表面积不会产生传感器性能的相应增加。然而，石墨烯桁架，它增加了一个平行的导电路径的传感表面，被发现提高灵敏度近2倍，突出了拓扑悬挂电路结构的优势时，增加3D微结构的传感电极。总的来说，将3D石墨烯微结构结合到传感器电极可以提供增加的灵敏度，并且气溶胶喷射印刷是实现这些导电微结构而无需任何印刷后处理的可行途径。
Three-dimensional (3D) graphene microstructures have the potential to boost performance in high-capacity batteries and ultrasensitive sensors. Numerous techniques have been developed to create such structures; however, the methods typically rely on structural supports, and/or lengthy post-print processing, increasing cost and complexity. Additive manufacturing techniques, such as printing, show promise in overcoming these challenges. This study employs aerosol jet printing for creating 3D graphene microstructures using water as the only solvent and without any post-print processing required. The graphene pillars exhibit conductivity immediately after printing, requiring no high-temperature annealing. Furthermore, these pillars are successfully printed in freestanding configurations at angles below 45° relative to the substrate, showcasing their adaptability for tailored applications. When graphene pillars are added to humidity sensors, the additional surface area does not yield a corresponding increase in sensor performance. However, graphene trusses, which add a parallel conduction path to the sensing surface, are found to improve sensitivity nearly 2×, highlighting the advantages of a topologically suspended circuit construction when adding 3D microstructures to sensing electrodes. Overall, incorporating 3D graphene microstructures to sensor electrodes can provide added sensitivity, and aerosol jet printing is a viable path to realizing these conductive microstructures without any post-print processing.