Journal
RSC ADVANCES
Volume 9, Issue 13, Pages 7375-7381Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra09742a
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Funding
- Ministry of Fiscal Indonesia Endowment Fund for Education (LPDP)
- Ministry of Research, Technology and Higher Education of the Republic of Indonesia
- Post-Doctoral World Class University Program [ITB 237/SK/I1.B02/2018]
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Liquid Carbon Dots (CDs) were successfully synthesized by hydrothermal method using urea and citric acid as raw materials. TEM images confirmed that the CDs have a spherical shape with a homogeneous distribution. The as-prepared liquid CDs could absorb ultraviolet (UV) and first near infra-red (NIR) window simultaneously. However, the photoluminescence (PL) of the liquid CDs was damaged by their quenching effect. To overcome this issue, the liquid CDs were dispersed in poly(vinyl) alcohol (PVA) to fabricate the composite film. Herein, the dual-peak absorption properties of the CDs/PVA composite films were investigated for the first time. The composite films could maintain the simultaneous UV and first NIR window absorption property even after being preheated up to 200 degrees C, implying that the structure of CDs was well retained during the transition from the liquid to films. Daylight treatment for seven days produced minimum changes in the UV-vis and PL spectra, which indicates that the CDs/PVA film has more stable optical properties than the liquid CDs.
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