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Mesoporous Semimetallic Conductors: Structural and Electronic Properties of Cobalt Phosphide Systems
Author(s) -
Pramanik Malay,
Tominaka Satoshi,
Wang ZhongLi,
Takei Toshiaki,
Yamauchi Yusuke
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201707878
Subject(s) - mesoporous material , materials science , cobalt , nanocrystalline material , crystallinity , phosphide , conductivity , chemical engineering , nanotechnology , composite material , chemistry , catalysis , metallurgy , metal , organic chemistry , engineering
Mesoporous cobalt phosphide (meso‐CoP) was prepared by the phosphorization of ordered mesoporous cobalt oxide (meso‐Co 3 O 4 ). The electrical conductivity of meso‐CoP is 37 times higher than that of nonporous CoP, and it displays semimetallic behavior with a negligibly small activation energy of 26 meV at temperatures below 296 K. Above this temperature, only materials with mesopores underwent a change in conductivity from semimetallic to semiconducting behavior. These properties were attributed to the coexistence of nanocrystalline Co 2 P phases. The poor crystallinity of mesoporous materials has often been considered to be a problem but this example clearly shows its positive aspects. The concept introduced here should thus lead to new routes for the synthesis of materials with high electronic conductivity.