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Start Over Author "Hanyang Zhang" Journal chemistry of materials
2 results on '"Hanyang Zhang"'

1. Effect of Copper Substrate Surface Orientation on the Reductive Functionalization of Graphene

Author

Baowen Li, Sang Kyu Kwak, Rodney S. Ruoff, Sung O Park, Dae Yeon Hwang, Yi Jiang, Mandakini Biswal, Hanyang Zhang, Xu Zhang, Christopher W. Bielawski, Da Luo, and Yuan Huang

Subjects
Copper substrate, Materials science, Graphene, General Chemical Engineering, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, law.invention, Chemical engineering, law, Substrate composition, Materials Chemistry, Surface modification, 0210 nano-technology
Abstract

Although substrate composition can influence the chemical reactivity of graphene, substrate lattice orientation provides a valuable alternative. The effect of Cu surface orientation on the reactivi...

Published
2019

2. Preparation, Characterization, and Structure Trends for Graphite Intercalation Compounds Containing Pyrrolidinium Cations

Author

Hanyang Zhang, Weekit Sirisaksoontorn, Michael M. Lerner, Yuanyuan Wu, and Vincent T. Remcho

Subjects
chemistry.chemical_classification, Thermogravimetric analysis, Materials science, Graphene, General Chemical Engineering, Inorganic chemistry, Intercalation (chemistry), Ethylenediamine, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, law.invention, chemistry.chemical_compound, Crystallography, chemistry, law, Monolayer, Materials Chemistry, Ammonium, Graphite, 0210 nano-technology, Alkyl
Abstract

New graphite intercalation compounds (GICs) containing N,N-n-alkyl substituted pyrrolidinium cation intercalates (Pyn.m, n, m = alkyl chain lengths) are obtained via cationic exchange from stage-1 donor-type GIC [Na(ethylenediamine)1.0]C15. Powder X-ray diffraction and thermogravimetric analyses are used to determine the GIC structures and compositions. [Py4.8]C47·0.71DMSO and [Py8.8]C48 with intercalate monolayers are obtained as stage-1 GICs with gallery expansions of 0.48 nm, whereas [Py1.18]C47 and [Py12.12]C80·0.25DMSO form stage-1 GICs with intercalate bilayers and gallery expansions of 0.81 nm. The gallery dimensions require that alkyl chain substituents orient parallel to the encasing graphene sheets. Smaller intercalate cations such as Py1.4, Py4.4, and Py1.8 either form high-stage GICs or do not form stable intercalation compounds. These results, along with those reported for graphite intercalation of other quaternary ammonium cations, indicate trends in graphite chemistry where larger intercala...

Published
2016

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