University of Oulu

ACS Appl. Nano Mater. 2023, 6, 6, 4887–4897

Hydrothermal synthesis of Ni₃TeO₆ and Cu₃TeO₆ nanostructures for magnetic and photoconductivity applications

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Author: Fernández-Catalá, Javier1,2; Singh, Harishchandra1; Wang, Shubo1;
Organizations: 1Nano and Molecular Systems Research Unit, University of Oulu, Oulu FIN-90014, Finland
2Materials Institute and Inorganic Chemistry Department, University of Alicante, Ap. 99, E-03080 Alicante, Spain
3Wihuri Physical Laboratory, Department of Physics and Astronomy University of Turku, Turku FIN-20014, Finland
4Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, FI-90570 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 7.1 MB)
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Language: English
Published: American Chemical Society, 2023
Publish Date: 2023-03-29


Despite great attention toward transition metal tellurates especially M₃TeO₆ (M = transition metal) in magnetoelectric applications, control on single phasic morphology-oriented growth of these tellurates at the nanoscale is still missing. Herein, a hydrothermal synthesis is performed to synthesize single-phased nanocrystals of two metal tellurates, i.e., Ni₃TeO₆ (NTO with average particle size ∼37 nm) and Cu₃TeO₆ (CTO ∼ 140 nm), using NaOH as an additive. This method favors the synthesis of pure NTO and CTO nanoparticles without the incorporation of Na at pH = 7 in MTO crystal structures such as Na₂M₂TeO₆, as it happens in conventional synthesis approaches such as solid-state reaction and/or coprecipitation. Systematic characterization techniques utilizing in-house and synchrotron-based characterization methods for the morphological, structural, electronic, magnetic, and photoconductivity properties of nanomaterials showed the absence of Na in individual particulate single-phase MTO nanocrystals. Prepared MTO nanocrystals also exhibit slightly higher antiferromagnetic interactions (e.g., TN-NTO = 57 K and TN-CTO = 68 K) compared to previously reported MTO single crystals. Interestingly, NTO and CTO show not only a semiconducting nature but also photoconductivity. The proposed design scheme opens the door to any metal tellurates for controllable synthesis toward different applications. Moreover, the photoconductivity results of MTO nanomaterials prepared serve as a preliminary proof of concept for potential application as photodetectors.

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Series: ACS applied nano materials
ISSN: 2574-0970
ISSN-E: 2574-0970
ISSN-L: 2574-0970
Volume: 6
Issue: 6
Pages: 4887 - 4897
DOI: 10.1021/acsanm.3c00630
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
114 Physical sciences
216 Materials engineering
Funding: Authors thank European Union-Next Generation EU, MINECO, and University of Alicante for a postdoctoral research grant (MARSALAS21-09), Jenny and Antti Wihuri Foundation, ERC (European Research Council) Starting Grant project UNIFY (grant agreement number 101039110), and Consolidator Grant CATCH (grant agreement no. 101002219).
EU Grant Number: (101039110) UNIFY - Hybrid piezoelectric–photovoltaic components pave the way for miniaturisation of IoT devices
(101002219) CATCH - Cross-dimensional Activation of Two-Dimensional Semiconductors for Photocatalytic Heterojunctions
Copyright information: © 2023 The Authors. Published by American Chemical Society.