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SnO_2 nanowires mixed nanodendrites for high ethanol sensor response
Surachet Phadungdhitidhada,Suvit Thanasanvorakun,Pongsri Mangkorntong,Supab Choopun,Nikorn Mangkorntong,Duangmanee Wongratanaphisan 한국물리학회 2011 Current Applied Physics Vol.11 No.6
Mixed morphology of SnO_2 nanowires and nanodendrites was synthesized on the gold-coated alumina substrates by carbothermal reduction of SnO_2 in closed crucible. The products were characterized by scanning electron microscopy, x-ray diffractometer, and transmission electron microscopy. Results showed the SnO_2 nanowires and the SnO_2 nanodendrites branched out from the main nanowires. Both SnO_2 nanostructures were pure tetragonal rutile structure. The nanowires were grown in [101] and [121]directions with the diameter of 50―150 nm and the length of a few 10 μm. The nanodendrites were about 100―300 nm in diameter. The growth mechanism of the SnO_2 nanostructures was also discussed. Characterization of ethanol gas sensor, based on the mixed morphology of the SnO_2 nanostructures, was carried out. The optimal temperature was about 360 ℃ and the sensor response was 120 for 1000 ppm of ethanol concentration.
Tailoring Cu2xTe quantum-dot-decorated ZnO nanoparticles for potential solar cell applications
Auttasit Tubtimtae,Surachet Phadungdhitidhada,Duangmanee Wongratanaphisan,Atcharawon Gardchareon,Supab Choopun 한국물리학회 2014 Current Applied Physics Vol.14 No.5
Cu2xTe QDs on ZnO nanoparticles were synthesized using a successive ionic layer absorption and reaction technique (SILAR) at room temperature. The as-synthesized QDs which were distributively deposited on ZnO nanoparticles surface were characterized by field emission scanning electron microscope (FE-SEM), X-ray diffraction and high-resolution transmittance microscope (HR-TEM). It revealed that the average diameter of the QDs was w2 nm. The synthesized Cu2xTe QDs were solely orthorhombic Cu1.44Te phase. The growth mechanism was supposed that it based on ions deposition. The energy gap of as-synthesized Cu2xTe QDs was determined w1.1 eV and the smallest energy gap of 0.76 eV was obtained, equal to that of bulk material. Raman spectroscopy and FTIR were also used to study the Cu2xTe QDs on ZnO nanoparticles. These characteristics suggest a promising implication for a potential broadband sensitizer of QDSCs.