Toward Quantum Confinement in Graphitic Carbon Nitride-Based Polymeric Monolayers

Autor:	Olatunde P. Olademehin, Kevin L. Shuford, Thomas L. Ellington
Rok vydání:	2021
Předmět:	chemistry.chemical_compound Heptazine chemistry Chemical physics Quantum dot Monolayer Graphitic carbon nitride Density of states Water splitting chemistry.chemical_element Density functional theory Physical and Theoretical Chemistry Carbon
Zdroj:	The Journal of Physical Chemistry A. 125:7597-7606
ISSN:	1520-5215 1089-5639
DOI:	10.1021/acs.jpca.1c04597
Popis:	Graphitic carbon nitride (g-C3N4) has garnered much attention due to its potential as an efficient metal-free photocatalyst. This study examines the evolution of properties in zero-dimensional quantum dots up to sizable clusters that mimic extended g-C3N4 monolayers. We employ density functional theory to investigate systematically the structural, electronic, and optical properties of the g-C3N4-based melamine and heptazine building blocks using a "bottom-up" construction of polymeric monolayers. The results from our computations indicate that the melamine- and heptazine-based polymeric g-C3N4 systems must be reduced to at least 2.74 and 4.00 nm, respectively, to observe an increase of its optical gap with a size reduction. The present study also examines the nature of the electronic transitions exhibited by g-C3N4-based monolayers through full natural transition orbital and density of state analyses. The most promising sites for water splitting and subsequent chemical doping studies are identified, which generally correspond to the nitrogen and carbon atoms, respectively.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d44b8f08210ebfce23149e98377af44a https://doi.org/10.1021/acs.jpca.1c04597 Zobrazit plný text záznamu