Plasma‐Assisted Growth of β‐MnO₂ Nanosystems as Gas Sensors for Safety and Food Industry Applications

Abstract

The development of efficient sensors for security field and food quality control applications has gained an ever‐increasing attention for various end‐uses. In this context, this work reports on the preparation of β‐MnO2 nanosystems by plasma enhanced‐chemical vapor deposition (PE‐CVD), using a fluorinated Mn(II) diamine‐diketonate as single‐source precursor for both Mn and F. Modulations of oxygen partial pressure enable to tailor not only the morphology and oxygen vacancy content, but also fluorine doping level of the resulting systems. For the first time, the gas sensing performances of PE‐CVD β‐MnO2 nanomaterials are tested in the detection of acetonitrile, a poisonous chemical warfare agent (CWA) simulant, and ethylene, an important marker of fruit ripening. The obtained results demonstrate that the fabricated sensors can efficiently detect these analytes, with the best responses at moderate temperatures (≤200 °C), enhanced by a higher oxygen vacancy content and fluorine concentration. These features, coupled with the good selectivity and response times, candidate the developed systems as amenable platforms for practical applications.

Protein‐Engineered Functional Materials for Bioelectronics

“…[ 41 ] Meanwhile, they are semiconducting materials and have gas detection ability by their sensitive change of bulk resistance when exposing to chemical gases. [ 42 ] Therefore, a substantial number of studies have exploited proteins as coassembly agents to design nanostructures of transition metal oxides.…”

Oxygen Self‐Sufficient Nanoplatform for Enhanced and Selective Antibacterial Photodynamic Therapy against Anaerobe‐Induced Periodontal Disease

“…[ 17–21 ] Among the nanozymes, MnO 2 nanostructures with low toxicity possessed excellent reactivity with a low concentration of H 2 O 2 to produce O 2 for effectively alleviating tumor hypoxia, so as to enhance the efficacy of PDT. [ 20,22–27 ] Besides PDT in tumor treatment, the nano‐MnO 2 based catalytic reaction of hydrogen peroxide to oxygen has also been used in water purification, [ 28 ] industrial sensors, [ 29 ] and air pollution control. [ 30 ] While this oxygen self‐supply method has not been utilized yet in terms of alleviating hypoxia of the periodontal disease environment.…”

α-MnO2 Nanowires as Potential Scaffolds for a High-Performance Formaldehyde Gas Sensor Device

“…Recently, Umar et al explored the ethanol gas sensing applications of the α-MnO 2 nanoparticles synthesized hydrothermally [16]. Barreca et al [29] reported synthesis of β-MnO 2 nano-systems through physical plasma enhanced chemical vapor deposition and analyzed the gas-sensing behavior toward acetonitrile and ethylene. High aspect ratio β-MnO 2 nanowires synthesized via a facile greener technique exhibited a sensitivity of 0.5 at 300 • C and a short response time of 10 s for 20 ppm H 2 gas.…”