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Enhanced Band Gap, Optical and Near-Infra-Red Reflecting Properties of Environmentally Benign Synthesized Nanocrystalline Gd2Ti2O7 Pyrochlore Materials

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The recent trend of reflecting the NIR rays with cool and color pigments to reduce the transfer of heat inside the buildings is highly encouraged. In this work, the pyrochlore-type Gd2Ti2O7 nanomaterials were synthesized through a hybrid process comprising planetary ball milling and chloride salt flux method. Different combination of alkali metal chloride fluxes was used to enhance the phase formation and purity. In order to investigate the phase formation, purity, particle size, optical property, morphology and elemental composition of the prepared samples, many characterization techniques including XRD, RAMAN, FT-IR, UV-vis, NIR, PL, and HRSEM-EDX were carried out. The XRD patterns revealed that the annealed materials crystallized in cubic structure with lattice parameter, a = 1.019(1) nm, and the ball milled product annealed with LiCl:NaCl and LiCl:CsCl flux crystallized in a single cubic phase with high purity. The FT-IR analysis confirmed the presence of metal oxide bonds (Gd–O vibration and Ti–O–Ti bending vibration) in the wavenumber regions 400 cm−1 and 500 cm−1. The band gap of the Gd2Ti2O7 powder is enhanced from 2.77 eV to 3.27 eV through the addition of LiCl:CsCl flux. The PL emission property of Gd2Ti2O7 is enhanced by annealing with flux under the excitation wavelength of 230 nm. Further, the band gap and NIR reflectivity of the nanomaterials are enhanced by the conditions employed in the synthesis method.
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Keywords: Chloride Flux; Gd2Ti2O7; NIR-Reflective Pigments; Optical Properties; Pyrochlore

Document Type: Research Article

Affiliations: 1: Advanced Nanomaterials Research Laboratory, Department of Nanotechnology, Noorul Islam Centre for Higher Education, Kumaracoil, Thuckalay 629180, Tamilnadu, India 2: Department of Biotechnology, Udaya School of Engineering, Udaya Nagar, Vellamodi, Ammandivilai 629204, Tamilnadu, India 3: Department of Chemistry, School of Advanced Sciences, Vellore Institute of the Technology, Vellore 632014, Tamilnadu, India

Publication date: April 1, 2020

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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