# From Glaphene to Glaphynes: A Hybridization of Two-Dimensional Silica Glass and Graphynes

## TL;DR

This paper introduces glaphynes, a new class of 2D materials combining silica glass and graphynes, and studies their stability and electronic properties.

## Contribution

The novel contribution is the proposal and computational analysis of glaphynes, a hybrid of silica and graphynes.

## Key findings

- Glaphynes show energetic and structural stability.
- The electronic proximity effect opens a band gap in some glaphyne structures.
- Not all glaphyne configurations exhibit band gap opening despite Si–O–C bond formation.

## Abstract

Hybrid two-dimensional
(2D) materials have attracted increasing
interest as platforms for tailoring electronic properties through
interfacial design. Very recently, a hybrid 2D material termed glaphene,
which combines monolayers of 2D silica glass and graphene, was experimentally
realized. Inspired by glaphenes, we proposed a class of similar structures
named glaphynes, which are formed by stacking SiO2 monolayers
onto α-, β-, and γ-graphynes. Graphynes are 2D carbon
allotropes with the presence of acetylenic groups (triple bonds).
The glaphynes’ structural and electronic properties were investigated
using the self-consistent-charge density functional tight-binding
(SCC-DFTB) method, as implemented in the DFTB+ package. Our analysis
confirms their energetic and structural stability. We have observed
that in the case of glaphynes, the electronic proximity effect can
indeed open the electronic band gap, but not for all cases, even with
the formation of Si–O–C bonds between silica and graphynes.