ZnCo2O4‑Based Nanoparticle Sensor for 1‑Pentanol Detection
Gabriela O Gera1, Gustavo S M Dos Santos2, André L M Freitas1
1Federal University of ABC (UFABC), Center for Natural and Human Sciences, Santo André, SP 09210580, Brazil.
Abstract:
When microbial volatile organic compounds (MVOCs) interact with humans, they can be harmful to health, causing irritation and discomfort. Additionally, they act as biomarkers for diseases. Despite the significance of this topic, there are still few detection tests available. This work explores the sensitive detection of MVOCs using semiconductor metal oxide (SMO). Therefore, this study aimed to evaluate the use of the monophase bimetallic structure ZnCo2O4 as a gas-sensing material for 1-pentanol detection, an MVOC that Trichothecium roseum and Staphylococcus aureus can produce. The study focused on analyzing the effect of a ZnCo2O4 nanostructure on enhancing the gas-sensing properties toward MVOCs detection. The material was prepared via microwave-assisted solvothermal processing and subsequently calcined at 300 °C to obtain a single-phase cubic ZnCo2O4. Characterization using XRD and FTIR revealed that the sample based on a bimetallic structure of ZnCo2O4 was successfully synthesized free of impurities, including the formation of undesired phases. Its performance as an MVOC sensor was analyzed for different volatiles, including 1-pentanol, 2-butanone, acetone, benzene, m-xylene, and toluene. The sensor demonstrated a higher selectivity for 1-pentanol, exhibiting the highest response of 83.6% to 1-pentanol (100 ppm) at 300 °C. Thus, this work presents an efficient method for producing single-phase cubic ZnCo2O4-based nanoparticles and demonstrates that this material exhibits enhanced sensing properties for the detection of 1-pentanol.
Insights
This study developed a new semiconductor metal oxide (SMO) sensor using ZnCo2O4 nanoparticles for detecting harmful microbial volatile organic compounds (MVOCs). The sensor shows high sensitivity and selectivity for 1-pentanol, a key disease biomarker.
Area of Science:
- Materials Science
- Chemical Sensing
- Biomarker Detection
Background:
- Microbial volatile organic compounds (MVOCs) pose health risks and serve as disease biomarkers.
- Current detection methods for MVOCs are limited, necessitating advanced sensing technologies.
- Semiconductor metal oxide (SMO) materials offer potential for sensitive gas detection.
Purpose of the Study:
- To evaluate ZnCo2O4 as a gas-sensing material for detecting 1-pentanol, an MVOC.
- To investigate the effect of ZnCo2O4 nanostructures on enhancing MVOC sensing capabilities.
- To develop an efficient synthesis method for single-phase cubic ZnCo2O4 nanoparticles.
Main Methods:
- Microwave-assisted solvothermal synthesis of ZnCo2O4 nanoparticles.
- Calcination at 300 °C to achieve a single-phase cubic structure.
- Characterization using X-ray Diffraction (XRD) and Fourier-Transform Infrared Spectroscopy (FTIR).
- Gas sensing performance analysis for various volatile organic compounds (VOCs) at different temperatures.
Main Results:
- Successfully synthesized pure, single-phase cubic ZnCo2O4 nanoparticles.
- The ZnCo2O4 sensor exhibited high selectivity towards 1-pentanol.
- Achieved a maximum sensor response of 83.6% to 100 ppm of 1-pentanol at 300 °C.
Conclusions:
- An efficient method for producing single-phase cubic ZnCo2O4 nanoparticles was established.
- ZnCo2O4 demonstrates enhanced gas-sensing properties for 1-pentanol detection.
- This material holds promise for developing sensitive MVOC detection systems.
