Wan Wubo, Zhao Zongbin, Liu Shaohong, Hao Xiaojuan, Hughes Timothy C, Qiu Jieshan
Yazhou Bay Innovation Institute, Hainan Tropical Ocean University 572022 Sanya Hainan China +86-898-88651738.
State Key Lab of Fine Chemicals, School of Chemical Engineering, Liaoning Key Lab for Energy Materials and Chemical Engineering, Dalian University of Technology Dalian 116024 China
Nanoscale Adv. 2024 Feb 2;6(6):1643-1647. doi: 10.1039/d3na00995e. eCollection 2024 Mar 12.
The controlled conformational changes of planar graphene nanosheets are of great importance to the realization of their practical applications. Despite substantial effort in the area, the controlled folding of two-dimensional (2D) graphene sheets into one-dimensional (1D) structures still remains a significant challenge. Here, for the first time, we report an ice crystal guided folding strategy to fabricate 1D folded graphene nanobelts (FGBs), where the formation and growth of ice crystals in a confined space function to guide the folding of 2D graphene oxide (GO) nanosheets into 1D nanobelts ( folded graphene oxide belts, FGOBs), which were subsequently converted to FGBs after annealing. Thin aqueous GO containing films were obtained by blowing air through a GO dispersion in the presence of a surfactant, polyoxypropylenediamine (D), resulting in a foam containing uniform air bubbles. Subsequent shock cooling of the foam using liquid nitrogen resulted in the facile fabrication of FGOBs. This technique provides a general approach to encapsulate catalytic nanomaterials such as FeO nanorods, TiO and CoO nanoparticles into the folded graphene structure for practical applications such as Li-ion batteries.
平面石墨烯纳米片的可控构象变化对于其实际应用的实现至关重要。尽管在该领域付出了巨大努力，但将二维（2D）石墨烯片折叠成一维（1D）结构仍然是一项重大挑战。在此，我们首次报道了一种冰晶引导折叠策略来制备一维折叠石墨烯纳米带（FGB），其中在受限空间中冰晶的形成和生长起到引导二维氧化石墨烯（GO）纳米片折叠成一维纳米带（折叠氧化石墨烯带，FGOB）的作用，随后在退火后将其转化为FGB。通过在表面活性剂聚氧化丙烯二胺（D）存在下，向GO分散体中吹气获得含GO的稀水膜，从而得到含有均匀气泡的泡沫。随后使用液氮对泡沫进行快速冷却，从而轻松制备出FGOB。该技术提供了一种通用方法，可将催化纳米材料（如FeO纳米棒、TiO和CoO纳米颗粒）封装到折叠石墨烯结构中，用于锂离子电池等实际应用。
