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  • Title: Langmuir-Blodgett self-assembly of ultrathin graphene quantum dot films with modulated optical properties.
    Author: Wang J, Yan H, Liu Z, Wang Z, Gao H, Zhang Z, Wang B, Xu N, Zhang S, Liu X, Zhang R, Wang X, Zhang G, Zhao L, Liu K, Sun X.
    Journal: Nanoscale; 2018 Nov 07; 10(41):19612-19620. PubMed ID: 30325382.
    Abstract:
    Multiple-color-emissive graphene quantum dots (GQDs) have great potential in diverse applications such as bioimaging, light emission, and photocatalysis. Growing interest in GQDs is largely focused on their macro-scale aggregations that could inherit the unique properties of individual dots. However, the lack of advanced fabrication methods limits the practical applications of GQDs. Here, we employed a Langmuir-Blodgett (LB) technique to fabricate ultrathin, high-quality GQD aggregated films with well-modulated optical properties in a wide range of wavelengths. Through the combination of a bottom-up synthesis of GQDs and the LB assembly method, uniform, closely packed, and ultra-thin GQD films can be self-assembled with a well-controlled thickness on different substrates. The photoluminescence (PL) spectra of ultra-thin GQD films have an obvious red-shift compared with isolated GQD solution. We then elucidate remarkably strong energy transfer in self-assembled GQDs. Furthermore, the ultra-thin GQD films exhibit a clear excitation-dependent PL that could almost cover the entire visible light. This convenient self-assembly method and systematic optical and physical studies of ultra-thin GQD films may provide a new direction for developing low-cost, GQD film-based light-emitting devices.
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