TY - JOUR
T1 - Well-defined colloidal 2-D layered transition-metal chalcogenide nanocrystals via generalized synthetic protocols
AU - Jeong, Sohee
AU - Yoo, Dongwon
AU - Jang, Jung Tak
AU - Kim, Minkyoung
AU - Cheon, Jinwoo
PY - 2012/11/7
Y1 - 2012/11/7
N2 - While interesting and unprecedented material characteristics of two dimensionality (2-D) layered nanomaterials are emerging, their reliable synthetic methodologies are not well developed. In this study we demonstrate general applicability of synthetic protocols to a wide range of colloidal 2-D layered transition-metal chalcogenide (TMC) nanocrystals. As distinctly different from other nanocrystals, we discovered that 2-D layered TMC nanocrystals are unstable in the presence of reactive radicals from elemental chalcogen during the crystal formation. We first introduce the synthesis of titanium sulfide and selenide where well-defined single crystallinity and lateral size controllability are verified, and then such synthetic protocols are extended to all of group IV and V transition-metal sulfide (TiS 2, ZrS 2, HfS 2, VS 2, NbS 2, and TaS 2) and selenide (TiSe 2, ZrSe 3, HfSe 3, VSe 2, NbSe 2, and TaSe 2) nanocrystals. The use of appropriate chalcogen source is found to be critical for the successful synthesis of 2-D layered TMC nanocrystals. CS 2 is an efficient chalcogen precursor for metal sulfide nanocrystals, whereas elemental Se is appropriate for metal selenide nanocrystals. We briefly discuss the effects of reactive radical characteristics of elemental S and Se on the formation of 2-D layered TMC nanocrystals.
AB - While interesting and unprecedented material characteristics of two dimensionality (2-D) layered nanomaterials are emerging, their reliable synthetic methodologies are not well developed. In this study we demonstrate general applicability of synthetic protocols to a wide range of colloidal 2-D layered transition-metal chalcogenide (TMC) nanocrystals. As distinctly different from other nanocrystals, we discovered that 2-D layered TMC nanocrystals are unstable in the presence of reactive radicals from elemental chalcogen during the crystal formation. We first introduce the synthesis of titanium sulfide and selenide where well-defined single crystallinity and lateral size controllability are verified, and then such synthetic protocols are extended to all of group IV and V transition-metal sulfide (TiS 2, ZrS 2, HfS 2, VS 2, NbS 2, and TaS 2) and selenide (TiSe 2, ZrSe 3, HfSe 3, VSe 2, NbSe 2, and TaSe 2) nanocrystals. The use of appropriate chalcogen source is found to be critical for the successful synthesis of 2-D layered TMC nanocrystals. CS 2 is an efficient chalcogen precursor for metal sulfide nanocrystals, whereas elemental Se is appropriate for metal selenide nanocrystals. We briefly discuss the effects of reactive radical characteristics of elemental S and Se on the formation of 2-D layered TMC nanocrystals.
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U2 - 10.1021/ja3089845
DO - 10.1021/ja3089845
M3 - Article
C2 - 23106819
AN - SCOPUS:84868573559
SN - 0002-7863
VL - 134
SP - 18233
EP - 18236
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 44
ER -