Boosting Gaseous Acetone Detection by Nanoheterojunctions of p-Type MWCNTs/PANI Integrated into 3D Flame-Synthesized n-Type ZnO

ACS Sensors, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 5, 2025

Accurate methods for detecting volatile organic compounds (VOCs) are essential noninvasive disease diagnosis, with breath analysis providing a simpler, user-friendly alternative to traditional diagnostic tools. However, challenges remain in low-temperature VOC solid-state sensors, especially concerning their selectivity and functionality at room temperature. Herein, we present key insights into optimizing multiwalled carbon nanotubes (MWCNTs)/polyaniline (PANI) ZnO nanocomposites efficient, light-free selective acetone sensing. We showcased novel prepared by integrating p-type MWCNTs/PANI porous 3D network of n-type nanoparticles, synthesized via flame spray pyrolysis, varying the weight ratios between (namely 1:1, 8:1, 32:1, 64:1). The 32:1 nanocomposite exhibited superior over toluene ethanol, resulting promise even As such, potential sensing mechanism was proposed, which involves nanoheterojunction formation ZnO, creating an accumulation layer that enhances gas response. Moreover, incorporation MWCNTs improved overall conductivity carrier mobility. Hence, believe this work offers valuable low-temperature, sensors.

Language: Английский

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Ultrasensitive acetone sensors based on bimetallic@In2O3 yolk-shell structures: From structural design to mechanism exploration

Ceramics International, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

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Heterostructured NixFe3-xO4 composites for sub-ppm acetone detection

Sensors and Actuators B Chemical, Journal Year: 2025, Volume and Issue: unknown, P. 137425 - 137425

Published: Feb. 1, 2025

Language: Английский

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Acetone detection at reduced temperatures: Engineering Cl‐doped ZnO nanodisks for enhanced gas‐sensing performance

Journal of the American Ceramic Society, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 7, 2025

Abstract This study presents the development of a groundbreaking acetone gas sensor leveraging Cl‐doped ZnO nanodisks, designed to operate efficiently at low temperatures. Through comprehensive experimental and theoretical analyses, they have elucidated exceptional sensing capabilities nanodisks. Both undoped with varying chlorine concentrations were synthesized on Si/SiO 2 substrates using straightforward thermal evaporation method in tube furnace. Notably, morphology pure formed microdisks, whereas transitioned increased Cl doping, it further evolved into nanoplates. X‐ray diffraction x‐ray photoelectron spectroscopy (XPS) confirmed successful substitution oxygen ions ions. Enhanced photoluminescence XPS analyses revealed that contained significantly higher density vacancies compared ZnO. The exhibited an outstanding sensitivity approximately 40 impressive selectivity 55% toward 100 ppm 80°C. doping markedly improved sensor's response recovery times, enabling detection as 225 ppb 80°C—a remarkable achievement unattainable All characterization results strongly indicate play pivotal role enhancing gas‐sensing performance Cutting‐edge functional theory calculations uncovered significant interactions between through charge variations band structure analysis. These resulted notable changes states, including distinct peak near −3 eV, indicating enhanced sensitivity.

Language: Английский

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Abnormal p‐type Gas‐Sensing Response to Ether in Co‐ZnO Nanocomposite Film and Its Significant Room‐Temperature Magnetoresistance

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 19, 2025

Abstract As a remarkable gas‐sensing material, ZnO is limited by the gas selectivity of its indiscriminate response to multiple gases. Herein, abnormal p‐type responses ether but n‐type othervolatile organic compoundsare observed in Co‐ZnO nanocomposite films. It should be attributed inversion region at particle interface, on which tends selectively adsorb. By controlling Co content, nanoflower structure realized, significantly increases adsorption sites and enhances eight times that film. Dual‐mode output based chemiresistive magnetoresistance offers another way improve selectivity. To this point, dual‐response granular film constructed with superficial 3 O 4 ‐ZnO p‐n heterojunction internal superparamagnetic conduction path. The high saturation magnetization 2990 Gs realized 26 at.% Co. P‐type resistance variation 12% room‐temperature ‐7% are simultaneously achieved.

Language: Английский

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Construction of SnO2 nanoparticles modified Bi/MoO3 nanosheets heterojunctions for fast response and highly selective ethanol sensing performance

Journal of Alloys and Compounds, Journal Year: 2025, Volume and Issue: 1016, P. 178977 - 178977

Published: Feb. 1, 2025

Language: Английский

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