A1 Refereed original research article in a scientific journal
Hydrothermal Synthesis of Ni3TeO6 and Cu3TeO6 Nanostructures for Magnetic and Photoconductivity Applications
Authors: Fernandez-Catala Javier, Singh Harishchandra, Wang Shubo B, Huhtinen Hannu, Paturi Petriina, Bai Yang, Cao Wei
Publisher: AMER CHEMICAL SOC
Publication year: 2023
Journal: ACS Applied Nano Materials
Journal name in source: ACS APPLIED NANO MATERIALS
Journal acronym: ACS APPL NANO MATER
Volume: 6
Issue: 6
First page : 4887
Last page: 4897
Number of pages: 11
DOI: https://doi.org/10.1021/acsanm.3c00630
Web address : https://pubs.acs.org/doi/10.1021/acsanm.3c00630
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/179198862
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 similar to 37 nm) and Cu3TeO6 (CTO similar to 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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