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Temperature-driven directional coalescence of silver nanoparticles
Yan, S; Sun, DB; Gong, Y; Tan, YY; Xing, XQ; Mo, G; Chen, ZJ; Cai, Q; Li, ZH; Yu, HY; Wu, ZH; Gong Y(宫宇); Xing XQ(邢雪青); Mo G(默广); Chen ZJ(陈中军); Cai Q(蔡泉); Li ZH(李志宏); Wu ZH(吴忠华)
2016
Source PublicationJOURNAL OF SYNCHROTRON RADIATION;JOURNAL OF SYNCHROTRON RADIATION
ISSN1600-5775
Volume23Pages:718-728
SubtypeArticle
AbstractSilver nanoparticles were synthesized with a chemical reduction method in the presence of polyvinylpyrrolidone as stabilizing agent. The thermal stability behavior of the silver nanoparticles was studied in the temperature range from 25 to 700 degrees C. Thermal gravimetric analysis was used to measure the weight loss of the silver nanoparticles. Scanning electron microscopy and high-resolution transmission electron microscopy were used to observe the morphology and the change in shape of the silver nanoparticles. In situ temperature-dependent small-angle X-ray scattering was used to detect the increase in particle size with temperature. In situ temperature-dependent X-ray diffraction was used to characterize the increase in nanocrystal size and the thermal expansion coefficient. The results demonstrate that sequential slow and fast Ostward ripening are the main methods of nanoparticle growth at lower temperatures (< 500 degrees C), whereas successive random and directional coalescences are the main methods of nanoparticle growth at higher temperatures (> 500 degrees C). A four-stage model can be used to describe the whole sintering process. The thermal expansion coefficient (2.8 x 10(-5) K-1) of silver nanoparticles is about 30% larger than that of bulk silver. To our knowledge, the temperature-driven directional coalescence of silver nanocrystals is reported for the first time. Two possible mechanisms of directional coalescence have been proposed. This study is of importance not only in terms of its fundamental academic interest but also in terms of the thermal stability of silver nanoparticles.
Keywordsilver nanoparticles SAXS XRD coalescence nanocrystal
DOI10.1107/S1600577516002253
Indexed BySCI
Language英语
WOS IDWOS:000375146200010
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/247884
Collection多学科研究中心
Affiliation中国科学院高能物理研究所
Recommended Citation
GB/T 7714
Yan, S,Sun, DB,Gong, Y,et al. Temperature-driven directional coalescence of silver nanoparticles[J]. JOURNAL OF SYNCHROTRON RADIATION;JOURNAL OF SYNCHROTRON RADIATION,2016,23:718-728.
APA Yan, S.,Sun, DB.,Gong, Y.,Tan, YY.,Xing, XQ.,...&Wu ZH.(2016).Temperature-driven directional coalescence of silver nanoparticles.JOURNAL OF SYNCHROTRON RADIATION;JOURNAL OF SYNCHROTRON RADIATION,23,718-728.
MLA Yan, S,et al."Temperature-driven directional coalescence of silver nanoparticles".JOURNAL OF SYNCHROTRON RADIATION;JOURNAL OF SYNCHROTRON RADIATION 23(2016):718-728.
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