Direct synthesis of high-quality graphene on dielectric substrates without a transfer process is of vital importance to aim at a variety of applications. Current strategies for boosting high-quality graphene growth, such as remote metal catalyzation otherwise are limited by poor performance with respect to the release of metal catalysts and hence suffer from the problem of metal residues. Herein, we report an effective approach that utilizes a metal-containing species, copper acetate, to continuously supply copper clusters in a gaseous form to aid transfer-free growth of graphene over a wafer scale. The thus-derived graphene films were found to show reduced multilayer density and improved electrical performance and exhibited a carrier mobility of 8500 cm2 V−1 s−1. Furthermore, droplet-based hydrovoltaic electricity generator devices based on directly grown graphene were found to exhibit robust voltage output and long cyclic stability, in stark contrast to their counterpart based on transferred graphene, demonstrating its potential for emerging energy harvesting applications. The work presented here offers a promising solution to organize the metal catalytic booster toward the transfer-free synthesis of high-quality graphene and enable smart energy generation.

中文翻译：

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醋酸铜促进高质量石墨烯的无转移生长，推动水力发电机的发展


在介电基板上直接合成高质量石墨烯而无需转移过程对于实现各种应用至关重要。目前促进高质量石墨烯生长的策略（例如远程金属催化）因金属催化剂释放方面的性能较差而受到限制，因此存在金属残留的问题。在此，我们报告了一种有效的方法，利用含金属物质乙酸铜连续供应气态铜簇，以帮助石墨烯在晶圆规模上的无转移生长。发现由此获得的石墨烯薄膜表现出降低的多层密度和改善的电性能，并且表现出8500 cm2 V−1 s−1的载流子迁移率。此外，基于直接生长石墨烯的液滴式水力发电机装置被发现表现出强大的电压输出和长循环稳定性，与基于转移石墨烯的同类装置形成鲜明对比，展示了其在新兴能量收集应用中的潜力。这里介绍的工作提供了一种有前途的解决方案，可以组织金属催化助推器实现高质量石墨烯的无转移合成并实现智能能源发电。