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Influence of water concentration on the solvothermal synthesis of VO2(B) nanocrystals.
- Source :
- CrystEngComm; 9/14/2022, Vol. 24 Issue 34, p6009-6017, 9p
- Publication Year :
- 2022
-
Abstract
- Nanocrystals of VO<subscript>2</subscript>(B) have attracted significant attention for their promising performance in electrochemical energy storage applications. Phase-purity and nanocrystal morphology are both crucial factors for the performance of these materials, but given the large number of crystal polymorphs available to VO<subscript>2</subscript>, achieving simultaneous control over crystal phase and nanocrystal size is a significant synthetic challenge. This paper describes the impact of water concentration on the synthesis of VO<subscript>2</subscript>(B) nanocrystals via solvothermal reaction of a molecular V(IV) precursor in toluene. Using controlled, stoichiometric amounts of water (20 equivalents per vanadium centre) enables access to short nanorods of VO<subscript>2</subscript>(B) whose lengths follow a Gaussian distribution with an average and standard deviation of 110 ± 30 nm. Decreasing the amount of water present to two or four equivalents results in formation of VO<subscript>2</subscript>(A) nanocrystals and eliminating it entirely results in no reaction. Increasing the amount of water to more than 20 equivalents increases the average length of the VO<subscript>2</subscript>(B) nanorods and causes the distribution in rod lengths to evolve from Gaussian to lognormal. This evolution in the size distribution is consistent with changes in a model Gaussian distribution observed upon simulated end-to-end oriented attachment events. These results demonstrate that control over the concentration of water is a useful strategy for tuning the morphology and crystal phase of VO<subscript>2</subscript> nanocrystals. [ABSTRACT FROM AUTHOR]
- Subjects :
- NANOCRYSTALS
CRYSTAL morphology
GAUSSIAN distribution
STANDARD deviations
NANORODS
Subjects
Details
- Language :
- English
- ISSN :
- 14668033
- Volume :
- 24
- Issue :
- 34
- Database :
- Complementary Index
- Journal :
- CrystEngComm
- Publication Type :
- Academic Journal
- Accession number :
- 158808066
- Full Text :
- https://doi.org/10.1039/d2ce00813k