{"title":"Competition of hydrogen desorption and migration on graphene surface in alternating electric field: Multiscale molecular dynamics and diffusion study","authors":"Alexey I. Podlivaev, Konstantin P. Katin","doi":"10.1016/j.apsusc.2024.162125","DOIUrl":null,"url":null,"abstract":"Hydrogen desorption and its migration on the graphene surface under the alternating electric field have been investigated with the tight-binding molecular dynamics and a large-scale diffusion model. The temperature and field amplitude were set within a range of 1000 to 1500 K and 0 to 1 V/Å, respectively. Field-induced oscillations of hydrogen atom were found to be essentially anharmonic. The optimal amplitude-dependent field frequencies resulting in the highest hydrogen displacement have been defined. The activation energies and frequency factors related to desorption and migration processes at varying electric field amplitudes have been calculated. Based on the microscopic data, we have proposed a diffusion model for hydrogens on locally irradiated graphene applicable at room temperature. A valuable reduction in the concentration of hydrogen in the irradiated graphene was observed. The width of the transition region between the non-irradiated graphene with high hydrogen concentration and the irradiated graphene with a reduced hydrogen concentration has been estimated.","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"7 1","pages":""},"PeriodicalIF":6.3000,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Surface Science","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.apsusc.2024.162125","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Hydrogen desorption and its migration on the graphene surface under the alternating electric field have been investigated with the tight-binding molecular dynamics and a large-scale diffusion model. The temperature and field amplitude were set within a range of 1000 to 1500 K and 0 to 1 V/Å, respectively. Field-induced oscillations of hydrogen atom were found to be essentially anharmonic. The optimal amplitude-dependent field frequencies resulting in the highest hydrogen displacement have been defined. The activation energies and frequency factors related to desorption and migration processes at varying electric field amplitudes have been calculated. Based on the microscopic data, we have proposed a diffusion model for hydrogens on locally irradiated graphene applicable at room temperature. A valuable reduction in the concentration of hydrogen in the irradiated graphene was observed. The width of the transition region between the non-irradiated graphene with high hydrogen concentration and the irradiated graphene with a reduced hydrogen concentration has been estimated.
期刊介绍:
Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.