Sol–gel synthesis of Ba-doped ZnO nanoparticles and its use in varistor ceramics

Micro & nano letters

article

Rong Yang¹  Xiao Qu¹  Mao-Hua Wang¹ 

[1] School of Petrochemical Engineering, Changzhou University;Huaide College, Changzhou University

关键词: barium;    zinc compounds;    II-VI semiconductors;    wide band gap semiconductors;    nanoparticles;    nanofabrication;    sol-gel processing;    semiconductor growth;    varistors;    ceramics;    annealing;    X-ray diffraction;    transmission electron microscopy;    X-ray chemical analysis;    scanning electron microscopy;    powder technology;    sintering;    semiconductor device breakdown;    sol-gel synthesis;    nanoparticles;    varistor ceramics;    annealing;    air atmosphere;    X-ray diffraction;    XRD;    transmission electron microscopy;    TEM;    energy dispersive X-ray spectroscopy;    scanning electron microscopy;    hexagonal lattice structure;    average crystalline size;    microstrain;    powders;    sintering;    electrical characteristics;    nonlinear coefficient;    breakdown voltage;    temperature 500 degC;    time 4 h;    temperature 1150 degC;    time 2 h;    ZnOBa;   

DOI  :  10.1049/mnl.2018.0150

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Three of imide intermediate products  were synthesized by reacting of phthalic anhydride with glycine (2a), and tetrachloro phthalic anhydride with glycine , (S)-2-[(tert-Butoxycarbonyl)amino]-3-aminopropionic acid ( 2b,c)  respectively   in  dry toluene  with azeotropic removal of water using Dean- stark apparatus then carboxyl functional group activated by refluxing with  thionyl chloride, the resulted acid chloride (3a-c) were reacted with different amine (5-flourouracil, 4-chloroaniline, 4-bromoaniline, 2-amino thiazole, and pyrrolidine) (4a-e) , the   resulted products consider as the end products (5a-j) while  the compounds (5k-o) required further reaction to deprotect aliphatic amine this achieved by treating the compounds with TFA to remove tert-Butoxycarbonyl group (6a-e). The alpha glucosidase inhibitory activity of some synthesized compounds (5a, 5f, 6a) were tested by using  -glucosidase from Saccharomyces cerevisiae, p-nitrophenol glucopyranoside (pNPG)  used as substrate and acarbose used as standard. All these test compounds shows   excellent inhibitory activity according to IC50 values which is ranging from (4.61-7.32).

【 授权许可】

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