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Copper acetate-facilitated transfer-free growth of high-quality graphene for hydrovoltaic generators

National Science Review 2022年第7期9卷 71-79页

作者： Jingyuan Shan Sunmiao Fang Wendong Wang Wen Zhao Rui Zhang Bingzhi Liu Li Lin Bei Jiang Haina Ci Ruojuan Liu Wen Wang Xiaoqin Yang Wenyue Guo Mark H.Rümmeli Wanlin Guo Jingyu Sun Zhongfan Liu Center for Nanochemistry (CNC) Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Academy for Advanced Interdisciplinary Studies Peking University Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education State Key Laboratory of Mechanics and Control of Mechanical Structures Institute of Nanoscience Nanjing University of Aeronautics and Astronautics Department of Physics and Astronomy University of Manchester School of Materials Science and Engineering China University of Petroleum (East China) College of Energy Soochow Institute for Energy and Materials Innovations (SIEMIS)Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy TechnologiesSoochow University Beijing Graphene Institute (BGI)

Direct synthesis of high-quality graphene on dielectric substrates without a transfer process is of vital importance for a variety of applications.Current strategies for boosting high-quality graphene growth,such as remote metal catalyzation,are limited by poor performance with respect to the release of metal catalysts and hence suffer from a problem with 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 of8500 cm~2 V-1s-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 counterparts based on transferred graphene,demonstrating the potential for emerging energy harvesting applications.The work presented here offers a promising solution to organize the metal catalytic booster toward transfer-free synthesis of high-quality graphene and enable smart energy generation.

关键词： chemical vapor deposition graphene copper acetate hydrovoltaic electricity generator transfer-free growth

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CO_(2)-promoted transfer-free growth of conformal graphene

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Nano Research 2023年第5期16卷 6334-6342页

作者： Ruojuan Liu Zhe Peng Xiaoli Sun Zhaolong Chen Zhi Li Haina Ci Bingzhi Liu Yi Cheng Bei Jiang Junxiong Hu Wanjian Yin Jingyu Sun Zhongfan Liu Center for Nanochemistry Beijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing Graphene Institute Beijing 100095China Beijing Cancer Hospital Beijing 100142China Department of Materials Science and Engineering National University of Singapore117575Singapore College of Energy Soochow Institute for Energy and Materials InnovationsSUDA-BGI Collaborative Innovation CenterSoochow UniversitySuzhou 215006China

Gaseous promotors have readily been adopted during the direct synthesis of graphene over insulators to enhance the growth quality and/or boost the growth rate.The understanding of the real functions of carbon-containing promotors has still remained elusive.In this study,we identify the critical roles of a representative CO_(2)promotor played in the direct growth of graphene.The comparative experimental trials validate CO_(2)as an effective modulator to decrease graphene nucleation density,improve growth kinetics,mitigate adlayer formation.The first-principles calculations illustrate that the generation of gas-phase OH species in CO_(2)-assisted system helps decrease the energy barriers of CH4 decomposition and carbon attachment to the growth front,which might be the key factor to allow high-quality direct growth.Such a CO_(2)-promoted strategy enables the conformal coating of graphene film over curved insulators,where the sheet resistance of grown graphene on quartz reaches as low as 1.26 kΩ·sq^(−1)at an optical transmittance of~95.8%.The fabricated endoscope lens based on our conformal graphene harvests an apoptosis of 82.8%for noninvasive thermal therapy.The work presented here is expected to motivate further investigations in the controllable growth of high-quality graphene on insulating substrates.

关键词： chemical vapor deposition graphene carbon dioxide transfer-free growth promotor conformal

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