In situ electron microscopy study of structural transformations in 2D CoSe2

Abstract Thermally induced structural transformation of 2D materials opens unique avenues for generating other 2D materials by physical methods. Imaging these transitions in real time provides insight into synthesis routes and property tuning. We have used in situ transmission electron microscopy (T...

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Autores principales:	Dnyaneshwar S. Gavhane, Heleen van Gog, Balu Thombare, Gaurav Lole, L. Christiaan Post, Mahendra A. More, Marijn A. van Huis
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/d607b77b1d5a46858b2d9aac7694f231
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spelling	oai:doaj.org-article:d607b77b1d5a46858b2d9aac7694f2312021-12-02T11:02:49ZIn situ electron microscopy study of structural transformations in 2D CoSe210.1038/s41699-021-00206-32397-7132https://doaj.org/article/d607b77b1d5a46858b2d9aac7694f2312021-02-01T00:00:00Zhttps://doi.org/10.1038/s41699-021-00206-3https://doaj.org/toc/2397-7132Abstract Thermally induced structural transformation of 2D materials opens unique avenues for generating other 2D materials by physical methods. Imaging these transitions in real time provides insight into synthesis routes and property tuning. We have used in situ transmission electron microscopy (TEM) to follow thermally induced structural transformations in layered CoSe2. Three transformation processes are observed: orthorhombic to cubic-CoSe2, cubic-CoSe2 to hexagonal-CoSe, and hexagonal to tetragonal-CoSe. In particular, the unit-cell-thick orthorhombic structure of CoSe2 transforms into cubic-CoSe2 via rearrangement of lattice atoms. Cubic-CoSe2 transforms to hexagonal-CoSe at elevated temperatures through the removal of chalcogen atoms. All nanosheets transform to basal-plane-oriented hexagonal 2D CoSe. Finally, the hexagonal to tetragonal transformation in CoSe is a rapid process wherein the layered morphology of hexagonal-CoSe is broken and islands of tetragonal-CoSe are formed. Our results provide nanoscopic insights into the transformation processes of 2D CoSe2 which can be used to generate these intriguing 2D materials and to tune their properties by modifying their structures for electro-catalytic and electronic applications.Dnyaneshwar S. GavhaneHeleen van GogBalu ThombareGaurav LoleL. Christiaan PostMahendra A. MoreMarijn A. van HuisNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ChemistryQD1-999ENnpj 2D Materials and Applications, Vol 5, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999 Dnyaneshwar S. Gavhane Heleen van Gog Balu Thombare Gaurav Lole L. Christiaan Post Mahendra A. More Marijn A. van Huis In situ electron microscopy study of structural transformations in 2D CoSe2
description	Abstract Thermally induced structural transformation of 2D materials opens unique avenues for generating other 2D materials by physical methods. Imaging these transitions in real time provides insight into synthesis routes and property tuning. We have used in situ transmission electron microscopy (TEM) to follow thermally induced structural transformations in layered CoSe2. Three transformation processes are observed: orthorhombic to cubic-CoSe2, cubic-CoSe2 to hexagonal-CoSe, and hexagonal to tetragonal-CoSe. In particular, the unit-cell-thick orthorhombic structure of CoSe2 transforms into cubic-CoSe2 via rearrangement of lattice atoms. Cubic-CoSe2 transforms to hexagonal-CoSe at elevated temperatures through the removal of chalcogen atoms. All nanosheets transform to basal-plane-oriented hexagonal 2D CoSe. Finally, the hexagonal to tetragonal transformation in CoSe is a rapid process wherein the layered morphology of hexagonal-CoSe is broken and islands of tetragonal-CoSe are formed. Our results provide nanoscopic insights into the transformation processes of 2D CoSe2 which can be used to generate these intriguing 2D materials and to tune their properties by modifying their structures for electro-catalytic and electronic applications.
format	article
author	Dnyaneshwar S. Gavhane Heleen van Gog Balu Thombare Gaurav Lole L. Christiaan Post Mahendra A. More Marijn A. van Huis
author_facet	Dnyaneshwar S. Gavhane Heleen van Gog Balu Thombare Gaurav Lole L. Christiaan Post Mahendra A. More Marijn A. van Huis
author_sort	Dnyaneshwar S. Gavhane
title	In situ electron microscopy study of structural transformations in 2D CoSe2
title_short	In situ electron microscopy study of structural transformations in 2D CoSe2
title_full	In situ electron microscopy study of structural transformations in 2D CoSe2
title_fullStr	In situ electron microscopy study of structural transformations in 2D CoSe2
title_full_unstemmed	In situ electron microscopy study of structural transformations in 2D CoSe2
title_sort	in situ electron microscopy study of structural transformations in 2d cose2
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d607b77b1d5a46858b2d9aac7694f231
work_keys_str_mv	AT dnyaneshwarsgavhane insituelectronmicroscopystudyofstructuraltransformationsin2dcose2 AT heleenvangog insituelectronmicroscopystudyofstructuraltransformationsin2dcose2 AT baluthombare insituelectronmicroscopystudyofstructuraltransformationsin2dcose2 AT gauravlole insituelectronmicroscopystudyofstructuraltransformationsin2dcose2 AT lchristiaanpost insituelectronmicroscopystudyofstructuraltransformationsin2dcose2 AT mahendraamore insituelectronmicroscopystudyofstructuraltransformationsin2dcose2 AT marijnavanhuis insituelectronmicroscopystudyofstructuraltransformationsin2dcose2
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In situ electron microscopy study of structural transformations in 2D CoSe2

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