Tailoring the optoelectronic properties of MoOX nanoparticles: a novel microwave-assisted synthesis for near-infrared absorbing polyoxometallic clusters

The emergence of novel catalytic, electrochemical, and biomedical applications of nanomaterials requires an understanding of their structural basis for stimuli-responsive performance. The chemistry of polyoxometallic nanomaterials, with a variety of interesting properties, remains poorly explored. In this study, microwave-assisted non-aqueous sol-gel synthesis was used for the first time to prepare nanoparticles based on polyoxomolybdates. Their optoelectronic properties, focusing on laser-triggered photothermal response, were investigated in detail depending on the synthesis temperature. Significant differences were observed between products prepared from the same precursor via a fast protocol by varying the synthesis temperature. Only low-temperature synthesis (≤ 90 °C) yielded near-infrared (NIR) photothermally active MoO<sub>X</sub> nanoparticles. The regular packing with large lattice defects of these clusters, along with a low reduction degree, allows water molecules to penetrate and interact with surface Mo = O bonds, forming intermediate electron states within the bandgap. These intermediate electron states are responsible for the NIR laser response suitable for photothermia. Additionally, the NIR response can be modulated in a controlled manner even after synthesis through electrochemical impedance spectroscopy. These findings have direct implications for MoO<sub>X</sub> photothermal therapy, targeted defect engineering of polyoxomolybdate structures, and their electrochemical and biological applications.

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Journal
Discover Nano
Published
2025-11-05
DOI
https://doi.org/10.1186/s11671-025-04378-5
Primary Topic
Polyoxometalates: Synthesis and Applications
Type
article
Field-Weighted Citation Impact
0.00

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article

Tailoring the optoelectronic properties of MoOX nanoparticles: a novel microwave-assisted synthesis for near-infrared absorbing polyoxometallic clusters

Giulia C. Fadda, Yoann Lalatonne, Vojtěch Nádaždy, Claire Wilhelm et al.
Discover Nano
Polyoxometalates: Synthesis and Applications
article

Tailoring the optoelectronic properties of MoOX nanoparticles: a novel microwave-assisted synthesis for near-infrared absorbing polyoxometallic clusters

Giulia C. Fadda, Yoann Lalatonne, Vojtěch Nádaždy, Claire Wilhelm, Peter Šiffalovič, Daniel Truchan, Mário Kotlár, Aurore Van de Walle, Adriana Annušová, M. Jergel, Peter Nádaždy, Matej Mičušík, Guilhem Curé
article en

Abstract

The emergence of novel catalytic, electrochemical, and biomedical applications of nanomaterials requires an understanding of their structural basis for stimuli-responsive performance. The chemistry of polyoxometallic nanomaterials, with a variety of interesting properties, remains poorly explored. In this study, microwave-assisted non-aqueous sol-gel synthesis was used for the first time to prepare nanoparticles based on polyoxomolybdates. Their optoelectronic properties, focusing on laser-triggered photothermal response, were investigated in detail depending on the synthesis temperature. Significant differences were observed between products prepared from the same precursor via a fast protocol by varying the synthesis temperature. Only low-temperature synthesis (≤ 90 °C) yielded near-infrared (NIR) photothermally active MoO<sub>X</sub> nanoparticles. The regular packing with large lattice defects of these clusters, along with a low reduction degree, allows water molecules to penetrate and interact with surface Mo = O bonds, forming intermediate electron states within the bandgap. These intermediate electron states are responsible for the NIR laser response suitable for photothermia. Additionally, the NIR response can be modulated in a controlled manner even after synthesis through electrochemical impedance spectroscopy. These findings have direct implications for MoO<sub>X</sub> photothermal therapy, targeted defect engineering of polyoxomolybdate structures, and their electrochemical and biological applications.

Discover NanoVol. 20(1)
Slovak University of Technology in Bratislava (SK), Centre National de la Recherche Scientifique (FR), Institute of Chemistry of the Slovak Academy of Sciences (SK), Inserm (FR), Université Paris Cité (FR), Slovak Academy of Sciences (SK), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris Sciences et Lettres (FR), Sorbonne Université (FR), Polymer Institute of the Slovak Academy of Sciences (SK), Université Sorbonne Paris Nord (FR), Sorbonne Paris Cité (FR), Assistance Publique – Hôpitaux de Paris (FR), Laboratoire Léon Brillouin (FR), Centre for Advanced Material Application of the Slovak Academy of Sciences (SK), CEA Paris-Saclay (FR), Hôpital Avicenne (FR), Laboratoire de Recherche Vasculaire Translationnelle (FR), Institute of Physics of the Slovak Academy of Sciences (SK), Physique des Cellules et Cancers (FR)
Univerzita Komenského v Bratislave, Slovenská Akadémia Vied, Institut National de la Santé et de la Recherche Médicale, Ministère de l'Europe et des Affaires Étrangères, Agentúra na Podporu Výskumu a Vývoja, Vedecká Grantová Agentúra MŠVVaŠ SR a SAV, European Regional Development Fund
Openalex Percentile: Top 74%
Polyoxometalates: Synthesis and Applications
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