Synthesis of Fluorescent Composite Materials Based on Graphitic Carbon Nitride
- PDF / 525,078 Bytes
- 4 Pages / 612 x 792 pts (letter) Page_size
- 58 Downloads / 213 Views
CAL MATERIALS
Synthesis of Fluorescent Composite Materials Based on Graphitic Carbon Nitride A. B. Bogomolova,b,*, S. A. Kulakovb, P. V. Zinina, V. A. Kutwitskiib, and M. F. Bulatova a Scientific
and Technological Center of Unique Instrumentation, Russian Academy of Sciences, Moscow, 117342 Russia b Russian Technological University, Moscow, 119571, Russia *e-mail: [email protected] Received January 15, 2020; revised March 23, 2020; accepted March 28, 2020
Abstract—A highly fluorescent composite powder based on graphitic carbon nitride (g-C3N4) is synthesized by thermal decomposition of melamine in the presence of nanoparticles of aluminum, titanium, and silicon oxides. The fluorescent properties of the composite nanoparticles excited at a wavelength of 532 nm are studied. The relative fluorescence quantum yield of the obtained material is 62%. Keywords: fluorescent material, composite material based on g-С3N4, fluorescence, relative quantum yield DOI: 10.1134/S0030400X20070048
INTRODUCTION The use of graphitic materials based on carbon nitride as catalysts has begun comparatively recently [1] despite the fact that the methods of synthesis of graphitic materials have been known since long ago (a review of these methods can be found in [2]). The family of graphitic carbon nitride materials includes a wide range of materials with different microstructures, from amorphous to nanocrystalline and nanoporous [3]. Many compounds described in the literature have a carbon-to-nitrogen ratio of 3 : 4, because of which they are denoted as g-C3N4. As a rule, these compounds are aggregates consisting of graphitic С–N layers in the sp2 hybridization state. The use of Raman scattering spectroscopy with IR excitation turned out to be very effective for investigating diamond-like states and graphitic phases [4] of the B–C–N system [5]. Recently, we have studied the chemical bonds of graphitic phases g-C3N4 using IR Raman spectroscopy [6]. The Raman spectrum of gC3N4 in the IR region considerably differs from the spectrum in the visible region. The IR spectrum exhibits two strong lines, at 691 and 988 cm–1, which are assigned to different types of the breathing modes of s-triazine rings. Our results for g-C3N4 in the IR region were confirmed in [7]. We plan to use this method to study graphitic and new C3N4 phases, as well as to observe the behavior of bonds in the sp2 and sp3 hybridization states under high pressures. Strong fluorescence of graphitic C3N4 modifications under action of laser irradiation was observed when studying Raman scattering [8]. To reduce
uncontrolled influence of the g-C3N4 fluorescence upon measurements of Raman scattering spectra, we used UV and IR lasers [8]. Even the first quantitative measurement of carbon nitride (CN) quantum dots showed that they can be effectively used as fluorescent labels with a quantum yield of 11% [9]. Investigations performed in the Scientific and Technological Center of Unique Instrumentation, Russian Academy of Sciences, showed that the fluorescence quantum yield of holl
Data Loading...
