Mesoporous WS₂-Decorated Cellulose Nanofiber-Templated CuO Heterostructures for High-Performance Chemiresistive Hydrogen Sulfide Sensors

Abstract

There is a great demand to develop high-performance hydrogen sulfide (H 2 S) sensors, especially at the trace level for environmental protection, human healthcare, and food freshness monitoring. To this end, cellulose nanofiber (CNF)templated CuO (CuO-C) was decorated with tungsten disulfide (WS 2 ) nanosheets (W-Cu-C) as the sensing layer of chemiresistive microelectromechanical system (MEMS) sensors for H 2 S recognition in this work. As compared to pristine CuO counterparts at 160.5 °C, the as-prepared W-Cu-C-10 sensors delivered a 30-fold enhanced response of 37 toward 0.5 ppm H 2 S at a lower optimal operation temperature of 100.1 °C. Moreover, a fast response/ recovery speed of 37.2/33.9 s toward 0.5 ppm H 2 S and excellent long-term stability and selectivity were achieved. Compared with existing research and commercial products, the W-CU-C-10 sensors exhibited the remarkable superiorities of high sensitivity, the lowest detection limit of 200 ppb, and ultralow power consumption (8 mW). Also, the sensor showcased a nice on-site application potential for evaluating eggs' freshness. The proposed W-Cu-C-10 sensors probably pave a new avenue for designing high-sensitivity and energy-efficient future H 2 S sensors, especially in the fields of portable and wearable detection systems as well as Internet of Things.

Self-Powered Wearable Gas Sensors Based on l-Ascorbate-Treated MXene Nanosheets and SnO2 Nanofibers

“…Whereas, the gas sensing performance in MXene is influenced by their surface termination groups (−O, −OH, and −F), which are dependent on their hexagonal layered crystal structure and chemical composition. As a result, the synergistic effect of SnO 2 and MXene in the SM nanocomposite enhances the overall surface area and tunes the electronic properties, which are beneficial for the gas sensing performance. , …”

“…As a result, the synergistic effect of SnO 2 and MXene in the SM nanocomposite enhances the overall surface area and tunes the electronic properties, which are beneficial for the gas sensing performance. 49,50 RT Gas Sensing Measurements. The selectivity study was carried out for SnO 2 nanofibers, MXene, and SM nanocomposite-based sensors by exposing 120 ppb of various oxidizing (nitrogen dioxide, sulfur dioxide, carbon dioxide, chlorine, bromine, and iodine) and reducing (isopropanol, ethanol, acetone, and ammonia) gases under 0% RH with an applied voltage of 1 V (Figure 6a).…”

Review of Chemical Sensors for Hydrogen Sulfide Detection in Organisms and Living Cells

“…Mulit-component composite materials can also help improve the sensitivity of sensors due to their excellent properties. In 2022, Li et al [ 34 ] used cellulose nanofiber (CNF)-templated CuO (CuO-C), which was decorated with tungsten disulfide (WS 2 ) nanosheets (W-Cu-C) as the sensing layer of electrochemical sensor for H 2 S recognition. A schematic diagram of the material preparation procedure is shown in Figure 5 .…”

Black Phosphorus Nanosheet/Tin Oxide Quantum Dot Heterostructures for Highly Sensitive and Selective Trace Hydrogen Sulfide Sensing

“…Among various H 2 S-detection technologies, metal oxide-based conductometric gas sensing has attracted considerable interest owing to its favorable stability, low cost, convenient preparation, and high compatibility with microelectronic processing. − However, shortcomings such as elevated operating temperature (OT), limited sensitivity, and severe cross-sensitivity largely hindered further applications. In recent decades, heterostructure composites have exhibited remarkable potential in the fields of electronics, optoelectronics, and catalysis .…”