Fabrication and characterization of graphene quantum dots thin film for reducing cross-sectional heat transfer through smart window. (July 2020)

• Record Type: Journal Article
• Authors: Nguyen, Tam D.; Yeo, Loo Pin; Si Yang, Kiw; Chiew Kei, Tan; Wang, Zhiwei; Mandler, Daniel; Magdassi, Shlomo; Tok, Alfred Iing Yoong
• Is Part Of: Materials research bulletin. Volume 127(2020)
• Publication Date: 2020-07
• Subjects: Graphene quantum dots -- Poly-Vinyl-Pyrrolidone -- Visible transmittance -- Cross-Sectional heat transfer -- Smart window; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2020.110861
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: GQDs thin film is fabricated on FTO glass by a facile drop casting method. GQDs thin film stabilized on FTO glass exhibits excellent optical properties of GQDs. GQDs thin film effectively minimizes cross-sectional heat transfer through glass. Abstract: Graphene and its derivatives have been reported as materials with excellent electrical and thermal conductivity, allowing for various promising applications. In particular, the large-scale surface coating of graphene-based materials can be employed to minimize cross-sectional heat transfer through the glass window. This study introduces a facile and cost-effective method to fabricate graphene quantum dots (GQDs) thin film on Fluorine-doped Tin Oxide (FTO) glass via casting of the GQDs dispersion and stabilizing with poly-vinyl-pyrrolidone (PVP). The thin film possesses excellent optical properties of GQDs and allows more than 80 % of visible transmittance. The presence of the GQDs thin film shows effective reduction in the cross-sectional thermal diffusivity of FTO glass, from 0.55 mm 2 /s to zero when measured with laser flash over a 4-second period. This low cost and eco-friendly GQDs thin film will be a promising material for heat management in smart window applications.