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RISS 인기검색어
- 검색키워드
- 저자 : Xiaoheng Liu (검색결과 4 건)
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Ag2O nanoparticle clusters coated with porous gelatin-g-PMMA copolymer
Ying Liu,Xiaoheng Liu,Xiaodong Wu,Xujie Yang,Lude Lu 한국물리학회 2010 Current Applied Physics Vol.10 No.3
Herein a special nanoparticle cluster coated with a porous copolymer is designed and prepared. At first,Ag2O nanoparticles (secondary particles) were fabricated in gelatin solution by a facile chemical approach. Then these nanoparticles were entrapped in a copolymerization system containing gelatin,methyl methacrylate (MMA), an initiator, and using water as a solvent. The nanoparticle clusters coated with porous gelatin-g-PMMA copolymer (Ag2O/gelatin-g-PMMA) were prepared by grafting methyl methacrylate onto gelatin, followed by coating solidification. One significant feature for our approach is that every Ag2O aggregated cluster has been coated with porous gelatin-g-PMMA copolymer film in a unique way, and the Ag2O nanoparticle could penetrate and escape from the coating freely in water by ultrasonication. As a result, this study provides a new approach to prepare monodispersed nanoparticles by ordered porous copolymers with controlled releasing.
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Lu Wang,Xiaoheng Liu,Xin Wang,Xujie Yang,Lude Lu 한국물리학회 2010 Current Applied Physics Vol.10 No.6
Mesoporous Co3O4 microspheres with unique crater-like morphology were obtained by utilizing the mesoporous silica material MCM-41 as a template. The analysis results of N2 adsorptionedesorption measurement indicate that the product has a large BrunauereEmmetteTeller (BET) surface area of 60 m2 g-1 and a narrow pore size distribution centering around 3.7 nm. Its electrochemical properties were investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS)measurements. The findings reveal that this novel morphology material has a smaller inner resistance of about 0.4 U and a higher onset frequency of 550 Hz. This material can provide a high specific capacitance of 102 F g-1 and a large capacity retention of 74% in 500 continuous cycles test at a sweep rate of 3 mV s-1. More significantly, the mass loading of electroactive species can reach as large as 2 mg cm-2, which is one order of magnitude larger than common amount used.
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Muhammad Arif,Zhang Min,Luo Yuting,Hongfei Yin,Xiaoheng Liu 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
A Bi2WO6-based hybrid heterostructure photocatalyst were fabricated by two step hydrothermal method. Bi2WO6 nanosheets with side length of 100–200 nm and thickness and about 20 nm thickness was homogeneously overcoated at the surface of CdS nanowires with an average diameter of 50 nm. The formation of hybrid heterostructures could efficiently enhanced the photocatalytic activity. The hybrid heterostructures photocatalyst of Bi2WO6/CdS achieved the highest photocatalytic H2 evolution (1223 μmol h−1g−1) under visible light irradiation which is much higher than the pristine CdS (602 μmol h−1g−1). Furthermore, the photocatalytic pollutant decomposition efficiency of hybrid heterostructures was well promoted compare to Bi2WO6 and CdS. The role of main oxidative species in the photocatalytic process was confirmed by the active species trapping experiments. The experimental results concluded that the enhanced photocatalytic activity and photostability of hybrid heterostructures is mainly associated with the Z-scheme photocatalytic charge transfer of the photogenerated charge carriers. Based on the obtained experimental results and calculation, a precise Z-scheme mechanism was proposed and discussed, which was further evaluated by the electrochemical spectroscopic study of the prepared photocatalyst. The Z-scheme photocatalytic system bestows the Bi2WO6/CdS hybrid heterostructures with efficient reducibility, stability and excellent oxidizability.
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Balamurugan Muthukutty,Jaysiva Ganesamurthi,Tse-Wei Chen,Shen-Ming Chen,Jaysan Yu,Xiaoheng Liu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
Owing to the enhanced electrical conductivity, sensitivity, selectivity, cost-effective, and simple samplingmethods, rare-earth pyrochlore structured stannates (M2Sn2O7) have been referred to as an elegant systemfor electrochemical sensing applications. Because of this, novel pyrochlore structure lanthanum stannatenanoparticles (La2Sn2O7 NPs) was synthesized via an eco-friendly method and further characterizedthrough various spectroscopic & microscopic techniques. The electrocatalytic property of La2Sn2O7 NPswas examined by fabricating it over a glassy carbon electrode (La2Sn2O7 NPs/GCE) in acidic media as aworking electrolyte. The effect of variables such as the amount of La2Sn2O7 NPs suspension and pH ofthe solution was optimized. Subsequently, after optimizing measurement conditions, the proposedLa2Sn2O7 NPs sensor shows excellent selectivity, sensitivity, linear ranges (0.01 to 127 mM & 127–1437mM), the limit of detection (6 nM) and limit of quantification (0.10 mM). The active sites, presence of metaloxide bonds, higher resistivity, and faster electron mobility paid away for the enhanced electrocatalyticactivity of the proposed sensor. Furthermore, the La2Sn2O7 NPs act as promising electrode modifiers forreal sample investigation of clove samples with accepted recovery rates (86–98%). Hence, the La2Sn2O7NPs sensor act as a hopeful electrode modifier for the determination of eugenol.
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