| Local chemical ordering and negative thermal expansion in ptni alloy nanoparticles | |
| Li, Qiang1; Zhu, He1; Zheng, Lirong2; Fan, Longlong1; Wang, Na1; Rong, Yangchun1; Ren, Yang3; Chen, Jun1; Deng, Jinxia1; Xing, Xianran1 | |
| 刊名 | Nano letters
 |
| 2017-12-01 | |
| 卷号 | 17期号:12页码:7892-7896 |
| 关键词 | Ptni alloy nanoparticles Extended x-ray absorption fine structure Atomic pair distribution function Negative thermal expansion Local ordering |
| ISSN号 | 1530-6984 |
| DOI | 10.1021/acs.nanolett.7b04219 |
| 通讯作者 | Xing, xianran(xing@ustb.edu.cn) |
| 英文摘要 | An atomic insight into the local chemical ordering and lattice strain is particular interesting to recent emerging bimetallic nanocatalysts such as ptni alloys. here, we reported the atomic distribution, chemical environment, and lattice thermal evolution in full-scale structural description of ptni alloy nanoparticles (nps). the different segregation of elements in the well-faceted ptni nanoparticles is convinced by extended x-ray absorption fine structure (exafs). atomic pair distribution function (pdf) study evidences the coexistence of the face-centered cubic and tetragonal ordering parts in the local environment of ptni nanoparticles. further reverse monte carlo (rmc) simulation with pdf data obviously exposed the segregation as ni and pt in the centers of {111} and {001} facets, respectively. layer-by-layer statistical analysis up to 6 nm for the local atomic pairs revealed the distribution of local tetragonal ordering on the surface. this local coordination environment facilitates the distribution of heteroatomic pt ni pairs, which plays an important role in the negative thermal expansion of pt41ni59 nps. the present study on ptni alloy nps from local short-range coordination to long-range average lattice provides a new perspective on tailoring physical properties in nanomaterials. |
| WOS关键词 | RAY-ABSORPTION SPECTROSCOPY ; OXYGEN REDUCTION ACTIVITY ; ELECTROCATALYSIS ; NANOCRYSTALS ; SEGREGATION |
| WOS研究方向 | Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics |
| WOS类目 | Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter |
| 语种 | 英语 |
| 出版者 | AMER CHEMICAL SOC |
| WOS记录号 | WOS:000418393300100 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2177842 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Xing, Xianran |
| 作者单位 | 1.Univ Sci & Technol Beijing, Dept Phys Chem, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100039, Peoples R China 3.Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA |
| 推荐引用方式 GB/T 7714 | Li, Qiang,Zhu, He,Zheng, Lirong,et al. Local chemical ordering and negative thermal expansion in ptni alloy nanoparticles[J]. Nano letters,2017,17(12):7892-7896. |
| APA | Li, Qiang.,Zhu, He.,Zheng, Lirong.,Fan, Longlong.,Wang, Na.,...&Xing, Xianran.(2017).Local chemical ordering and negative thermal expansion in ptni alloy nanoparticles.Nano letters,17(12),7892-7896. |
| MLA | Li, Qiang,et al."Local chemical ordering and negative thermal expansion in ptni alloy nanoparticles".Nano letters 17.12(2017):7892-7896. |
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