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Effect of Be codoping on the photoluminescence spectra of GaMnAs
Fucheng Yu,P.B. Parchinskiy,김도진,김효진,Young Eon Ihm,최덕균 한국물리학회 2011 Current Applied Physics Vol.11 No.3
The measurements of the photoluminescence (PL) spectra have been performed on GaAs, GaMnAs,GaAs:Be, and GaMnAs:Be samples to study the effect of Be codoping on the PL spectra of GaMnAs layers grown via low temperature molecular beam epitaxy. Based on the temperature dependence of the exciton-related transitions energy, it was shown that doping GaAs with Mn and Be leads to modification of the temperature dependence of the band gap. It was shown that although Be itself weakly affected the PL spectra of GaAs, codoping with Be significantly modified the PL spectra of GaMnAs.
The Effects of Codoping of Be and Mg on Incorporation of Mn in GaAs
Yu, Fucheng,Gao, Cunxu,Parchinskiy, P.B.,Chandra, Sekar.P.V.,Kim, Do-Jin,Kim, Chang-Soo,Kim, Hyo-Jin,Ihm, Young-Eon Materials Research Society of Korea 2008 한국재료학회지 Vol.18 No.8
Samples of GaMnAs, GaMnAs codoped with Be, and GaMnAs simultaneously codoped with Be and Mg were grown via low-temperature molecular beam epitaxy (LT-MBE). Be codoping is shown to take the Ga sites into the lattice efficiently and to increase the conductivity of GaMnAs. Additionally, it shifts the semiconducting behavior of GaMnAs to metallic while the Mn concentration in the GaMnAs solid solution is reduced. However, with simultaneous codoping of GaMnAs with Be and Mg, the Mn concentration increases dramatically several times over that in a GaMnAs sample alone. Mg and Be are shown to eject Mn from the Ga sites to form MnAs and MnGa precipitates.
Synthesis, Characterization and Application of Grafted Starch Prepared with Microwave-assistance
Yangshuo Liu,Teng Luo,Ming Li,Fucheng Yu 한국고분자학회 2017 폴리머 Vol.41 No.3
Butyl acrylate grafted starch (St-g-BA) was made by the method of microwave-assisted synthesis, involving the combination of microwave irradiation and a chemical free radical initiator (H₂O2-Fe<SUP>2+</SUP>) to initiate the grafting reaction. The optimal conditions for the graft copolymerization with respect to reaction microwave power, exposure time and type of initiator were investigated. Under the optimal conditions, the percent grafting and grafting efficiency were 26.2% and 85.9%, respectively. The grafted starch was characterized by using Fourier transform infrared spectroscopy and scanning electron microscopy. The St-g-BA exhibited good tensile strength, elongation at break and abrasion resistance. Therefore, it is suggested this biomaterial could be used in various industrial applications such as textile sizing and food packaging.