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<p>The growing demand for reliable photoelectrochemical detection in environmental monitoring, biomedical sensing, and emerging optoelectronic technologies has stimulated extensive research on wide-bandgap transition metal oxides such as molybdenum trioxide (MoO<sub>3</sub>). In this work, porous MoO<sub>3</sub> nanorods were synthesized via a facile hydrothermal method and systematically investigated for their structural, optical, morphological, and electrochemical properties. X-ray diffraction analysis confirmed the formation of an orthorhombic crystalline phase, while UV–Visible spectroscopy revealed strong optical absorption with an estimated bandgap of 2.9&#xa0;eV. Brunauer–Emmett–Teller (BET) analysis demonstrated a mesoporous nature with a moderate specific surface area and a volume-weighted average pore diameter of ~ 3.4&#xa0;nm, which is consistent with the porous nanorod-like morphology observed from field-emission scanning electron microscopy. Electrochemical studies indicated predominantly diffusion-controlled charge transfer behavior. Photoelectrochemical detection studies, carried out using chronoamperometry under simulated illumination, exhibited clear and reproducible photocurrent responses. The MoO<sub>3</sub> nanorods demonstrated a maximum responsivity of 7.08&#xa0;mA/W at 2.0&#xa0;V bias with a fast response time of 1.2&#xa0;s, highlighting efficient light-induced charge separation and transport. The combined structural, optical, and photoelectrochemical characteristics establish porous MoO<sub>3</sub> nanorods as promising photoactive materials for future photodetection and optoelectronic applications.</p>

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Photoelectrochemical detection behavior of porous MoO3 nanorods synthesized via facile hydrothermal method

  • 期刊论文

  • 发表日期：

    2026年4月11日

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  • Soumya Rai,
  • Chhaya Ravi Kant

摘要

The growing demand for reliable photoelectrochemical detection in environmental monitoring, biomedical sensing, and emerging optoelectronic technologies has stimulated extensive research on wide-bandgap transition metal oxides such as molybdenum trioxide (MoO3). In this work, porous MoO3 nanorods were synthesized via a facile hydrothermal method and systematically investigated for their structural, optical, morphological, and electrochemical properties. X-ray diffraction analysis confirmed the formation of an orthorhombic crystalline phase, while UV–Visible spectroscopy revealed strong optical absorption with an estimated bandgap of 2.9 eV. Brunauer–Emmett–Teller (BET) analysis demonstrated a mesoporous nature with a moderate specific surface area and a volume-weighted average pore diameter of ~ 3.4 nm, which is consistent with the porous nanorod-like morphology observed from field-emission scanning electron microscopy. Electrochemical studies indicated predominantly diffusion-controlled charge transfer behavior. Photoelectrochemical detection studies, carried out using chronoamperometry under simulated illumination, exhibited clear and reproducible photocurrent responses. The MoO3 nanorods demonstrated a maximum responsivity of 7.08 mA/W at 2.0 V bias with a fast response time of 1.2 s, highlighting efficient light-induced charge separation and transport. The combined structural, optical, and photoelectrochemical characteristics establish porous MoO3 nanorods as promising photoactive materials for future photodetection and optoelectronic applications.