This article demonstrates the use of a p-MoS2/n-WO3 heterojunctions based ultra sensitive and selective chemiresistive ammonia sensor that operates at 200◦ C. Surprisingly, composite exhibited significant enhancement in sensing as compared to MoS2 (p-type) WO3 (n-type) counterparts. The device also displayed excellent response-recovery features over wider range concentration together with superior nature toward acetone, ethanol, methanol, isopropanol, formaldehyde, benzene, hydrogen sulfide....

Designing a material with novel sensing properties under extreme working conditions has remained challenging task. Here, we report facile two-step approach to develop MoS2/MoO3 composite enhanced surface properties. When used as gas sensor at 25 °C, it displayed superior properties, selectivity, and stable response toward ammonia against various reducing oxidizing gases highly humid (relative humidity ≈ 95%). The exhibited relative of ≈55% (15% for 1 ppm) 50 ppm NH3 smaller τres. recovery...

We report a highly sensitive and selective ammonia (NH3) gas sensor made from liquid exfoliated MoSe2 nanosheets. The powder obtained after exfoliation was used to make two-terminal on quartz substrate with predeposited silver contacts. device so obtained, exhibited excellent sensitivity (5.5%) at an concentration down 1 ppm, fast response recovery time of 15 135 s, respectively, better reproducibility, impressive selectivity against various gases room temperature. Moreover, density...

Layered two-dimensional transition metal dichalcogenides, due to their semiconducting nature and large surface-to-volume ratio, have created own niche in the field of gas sensing. Their recovery time accompanied incomplete result inferior sensing properties. Here, we report a composite-based strategy overcome these issues. In this study, facile double-step synthesis MoS2/SnO2 composite its successful use as superior room-temperature ammonia sensor. Contrary pristine nanosheet-based sensors,...

Continuous detection of toxic and hazardous gases like nitric oxide (NO) ammonia (NH3) is needed for environmental management noninvasive diagnosis various diseases. However, to the best our knowledge, dual these two has not been previously reported. To address challenge, we demonstrate design fabrication low-cost NH3 NO gas sensors using tungsten disulfide/multiwall carbon nanotube (WS2/MWCNT) nanocomposites as sensing channels which maintained their performance in a humid environment. The...

High performance with lower power consumption is one among the essential features of a sensing device. Minute traces hazardous gases such as NO2 are difficult to detect. Tin disulfide (SnS2) nanosheets have emerged promising sensor. However, their poor room-temperature conductivity gives rise inferior sensitivity and sluggish recovery rates, thereby hindering applications. To mitigate this problem, we present low-cost ultrasensitive gas sensor tin disulfide/multiwalled carbon nanotube...

Two-dimensional molybdenum disulfide (MoS2) with high surface area and layered structure has received substantial attention for its potential use in detecting volatile organic compounds (VOCs) trace gases good relative response selectivity at room temperature. However, two of the long-standing challenges to broader MoS2 are poor recovery kinetics susceptibility oxidation a humid environment. To address these issues, we present chemiresistive sensor based on MoS2/SWCNTs composite as sensing...

Detecting and distinguishing between hazardous gases with similar odors by using conventional sensor technology for safeguarding human health ensuring food safety are significant challenges. Bulky, costly, power-hungry devices, such as that used gas chromatography-mass spectrometry (GC-MS), widely employed sensing. Using a single chemiresistive semiconductor or electric nose (e-nose) to achieve this objective is difficult, mainly because of its selectivity issue. Thus, there need develop new...

Volatile organic sulfur compounds (VOSCs) serve not only as biomarkers for dental diseases such halitosis but also a tracer monitoring air quality. Room-temperature selective detection and superior sensitivity against VOSCs at sub-ppm level has remained challenging task. Here, we propose heterostructure-based design using MoSe2/SnO2 composite achieving sensitive of ethyl mercaptan room temperature. The was synthesized via facile two-step method. A composite-based device shown down to 1 ppm...

A sensitive and temperature-based selective sensor toward hydrogen sulfide ethanol using MoS2/WO3 composite as a sensing surface was developed in this work. The nanocomposite successfully obtained facile two-step method. Structural analysis revealed the successful formation of composite. Further, n-type semiconducting nature initial gas-sensing measurements also confirmed via Mott-Schottky plots. composite-based showed preferential detection (260 °C) (320 by simply modulating temperature...

As a typical volatile organic compound (VOC), N,N-dimethylformamide (DMF) is popular solvent and tracer for environmental air quality monitoring. Highly selective detection with low electrical noise, quick response/recovery times, superior sensitivity at room temperature against VOCs, especially the parts per billion (ppb) level, continues to be significant challenge in gas-sensing applications. To address issue, herein we demonstrate an MoSe2/multiwalled carbon nanotube composite based...

Abstract Detection and discrimination of volatile organic compounds (VOCs) is important to provide a more realistic assessment their potential implication in complex environments medical diagnostics based on biomarkers. Herein, chemiresistive sensors are fabricated using stacked MoS 2 nanoflakes with defects exposed‐edge sites. The sensor found be extremely selective triethylamine (TEA) over polar, non‐polar VOCs atmospheric gases. exhibits sensitivity 1.72% ppm −1 , fast response/recovery...

2D SnO 2 nanosheets based chemiresistive sensor with microporosity and oxygen rich-surface detects ammonia at room temperature in extreme humidity ppb levels for breath early disease diagnostics healthcare.

Triethylamine (TEA) poses a significant threat to our health and is extremely difficult detect at the parts-per-billion (ppb) level room temperature. Carbon nanotubes (CNTs) are versatile materials used in chemiresistive vapor sensing. However, achieving high sensitivity selectivity with low detection limit remains challenge for pristine CNTs, hindering their widespread commercial application. To address these issues, we propose functionalized multiwalled CNTs (MWCNTs) carboxylic acid...

Abstract Volatile amines in breath act as biomarkers for kidney and liver diseases. Monitoring these amines, especially when present a mixture, provides insights into the metabolic state of body. This study focuses on differentiating volatile by systematically modulating conductivity sensitivity WSe 2 /Multiwalled Carbon Nanotubes composite‐based sensors. The fabricated chemiresistive sensor array demonstrates high selectivity, (7.67% ppm −1 ), fast response recovery kinetics (32 s/137 s),...