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Surface Defines the Properties: Colloidal Bi2Se3 Nanosheets with High Electrical Conductivity
Christoph Bauer,
Rostyslav Lesyuk,
Mahdi Samadi Khoshkhoo,
Christian Klinke 
,
Vladimir Lesnyak,
Alexander Eychmüller
,
Vladimir Lesnyak,
Alexander Eychmüller
The Journal of Physical Chemistry C, Volume: 125, Issue: 11, Pages: 6442 - 6448
Swansea University Author:
Christian Klinke
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DOI (Published version): 10.1021/acs.jpcc.1c00491
Abstract
We investigated the colloidal synthesis of Bi2Se3 nanosheets in ethylene glycol with the goal of increasing their lateral dimensions while keeping their thickness within a few nanometers. The influence of proton-donating sulfuric acid was found to be a triggering factor that promoted the lateral gro...
| Published in: | The Journal of Physical Chemistry C |
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| ISSN: | 1932-7447 1932-7455 |
| Published: |
American Chemical Society (ACS)
2021
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa56731 |
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| Abstract: |
We investigated the colloidal synthesis of Bi2Se3 nanosheets in ethylene glycol with the goal of increasing their lateral dimensions while keeping their thickness within a few nanometers. The influence of proton-donating sulfuric acid was found to be a triggering factor that promoted the lateral growth of up to 10 μm, whereas the thickness remained in the range 10–12 nm. The lateral size distribution was further optimized by size-selective precipitation enabling individual contacting of the nanosheets by electron-beam lithography. Electrical characterization of individually contacted nanosheets revealed a metal-like temperature dependence of the resistivity and values of the specific conductivity in the range of 470 S/cm at room temperature and 880 S/cm at 5.5 K, which is attributed to the surface-induced off-stoichiometry. The presented colloidal nanosheets can potentially serve as a platform for further studies on topologically nontrivial surface states and arising quantum phenomena in two-dimensional systems. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
11 |
| Start Page: |
6442 |
| End Page: |
6448 |