Ultra-Fast NO<sub>2</sub> Detection by MoS<sub>2</sub> Nanoflakes at Room Temperature

Gorthala, Guruprasad; Ghosh, Ruma

doi:10.1109/jsen.2022.3187445

Cited by 14 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This indicates the transformation of the conducting WS 2 bulk into semiconducting WS 2 nanomaterials post-exfoliation. The dimensional reduction is identified as the driving factor for the observed increase in bandgap from bulk material to nanostructures [28]. The FTIR spectra of WS 2 bulk, BS-WS 2 , and PS-WS 2 samples indicate the absence of peaks at 877 and 1044 cm −1 in the bulk sample, which are associated with W-O-W and W-OH bonds (figure 2(c)).…”

Section: Nanomaterials Characterizationsmentioning

confidence: 99%

Atomically thin-layered WS₂ based resistive sensors for detection of CO and NO₂ at room temperature

Gorthala,

Ghosh

2024

Nanotechnology

View full text Add to dashboard Cite

The number of layers present in a two-dimensional (2D) nanomaterial plays a critical role in applications that involve surface interaction, for example, gas sensing. This paper reports the synthesis of 2D WS2 nanoflakes using the facile liquid exfoliation technique. The nanoflakes were exfoliated using bath sonication (BS-WS2) and probe sonication (PS-WS2). The thickness of the BS-WS2 was found to range between 70 – 200 nm, and that of PS-WS2 varied from 0.6 to 80 nm, indicating the presence of single to few layers of WS2 when characterized using atomic force microscope (AFM). All the WS2 samples were thoroughly characterized using electron microscopes, X-ray diffractometer, Raman spectroscopy, UV-Visible spectroscopy, Fourier Transform Infrared spectroscope, and thermogravimetric analyser. Both the nanostructured samples were exposed to 2 ppm of NO2 at room temperature. Interestingly, BS-WS2 which comprises of a greater number of WS2 layers exhibited –14.2% response as against –3.4% response of PS-WS2, the atomically thin sample. The BS-WS2 sample was found to be highly selective towards NO2 but was slower (with incomplete recovery) as compared to PS-WS2. The PS-WS2 sample was observed to exhibit –11.9 to – 27.4% response to 2–10 ppm of CO and –3.4 to 35.2% response to 2–10 ppm of NO2 at room temperature, thereby exhibiting the potential to detect two gases simultaneously. These gases could be accurately predicted and quantified if the response times of the PS-WS2 sample were considered. The atomically thin WS2-based sensor exhibited a limit of detection (LOD) of 131 and 81 ppb for CO and NO2, respectively.

show abstract

Section: Nanomaterials Characterizationsmentioning

confidence: 99%

Atomically thin-layered WS₂ based resistive sensors for detection of CO and NO₂ at room temperature

Gorthala,

Ghosh

2024

Nanotechnology

View full text Add to dashboard Cite

show abstract

“…[ 116 , 120 , 122 , 128 , 130 ]). TMDs are also found in nanoflakes’ structure [ 118 , 119 , 125 ] and nanoflowers [ 131 ].…”

Section: Selected Categories Of Ultrafast Chemiresistorsmentioning

confidence: 99%

“… LOD (ppm) Range of Det. (Min–Max) (ppm) Target Gas Gases Used to Test Selectivity [ 116 ] 1.0–200

ethanol,

[ 117 ] 0.2 0.2–100

Ethanol, acetone, ethylene, toluene, ammonia,

[ 118 ]

[ 119 ] 0.190 3.0–150

, 2NT,

[ …”

Section: Table A1mentioning

confidence: 99%

Disclosing Fast Detection Opportunities with Nanostructured Chemiresistor Gas Sensors Based on Metal Oxides, Carbon, and Transition Metal Dichalcogenides

Galvani,

Freddi,

Sangaletti

2024

Sensors

View full text Add to dashboard Cite

With the emergence of novel sensing materials and the increasing opportunities to address safety and life quality priorities of our society, gas sensing is experiencing an outstanding growth. Among the characteristics required to assess performances, the overall speed of response and recovery is adding to the well-established stability, selectivity, and sensitivity features. In this review, we focus on fast detection with chemiresistor gas sensors, focusing on both response time and recovery time that characterize their dynamical response. We consider three classes of sensing materials operating in a chemiresistor architecture, exposed to the most investigated pollutants, such as NH3, NO2, H2S, H2, ethanol, and acetone. Among sensing materials, we first selected nanostructured metal oxides, which are by far the most used chemiresistors and can provide a solid ground for performance improvement. Then, we selected nanostructured carbon sensing layers (carbon nanotubes, graphene, and reduced graphene), which represent a promising class of materials that can operate at room temperature and offer many possibilities to increase their sensitivities via functionalization, decoration, or blending with other nanostructured materials. Finally, transition metal dichalcogenides are presented as an emerging class of chemiresistive layers that bring what has been learned from graphene into a quite large portfolio of chemo-sensing platforms. For each class, studies since 2019 reporting on chemiresistors that display less than 10 s either in the response or in the recovery time are listed. We show that for many sensing layers, the sum of both response and recovery times is already below 10 s, making them promising devices for fast measurements to detect, e.g., sudden bursts of dangerous emissions in the environment, or to track the integrity of packaging during food processing on conveyor belts at pace with industrial production timescales.

show abstract

Resistive Sensors for Continuous Monitoring of Air Pollution

Gorthala,

Kulkarni,

Ghosh

2023

Organic and Inorganic Materials Based Sensors

View full text Add to dashboard Cite

Ultra-Fast NO₂ Detection by MoS₂ Nanoflakes at Room Temperature

Cited by 14 publications

References 0 publications

Atomically thin-layered WS₂ based resistive sensors for detection of CO and NO₂ at room temperature

Atomically thin-layered WS₂ based resistive sensors for detection of CO and NO₂ at room temperature

Disclosing Fast Detection Opportunities with Nanostructured Chemiresistor Gas Sensors Based on Metal Oxides, Carbon, and Transition Metal Dichalcogenides

Resistive Sensors for Continuous Monitoring of Air Pollution

Contact Info

Product

Resources

About

Ultra-Fast NO2 Detection by MoS2 Nanoflakes at Room Temperature

Cited by 14 publications

References 0 publications

Atomically thin-layered WS2 based resistive sensors for detection of CO and NO2 at room temperature

Atomically thin-layered WS2 based resistive sensors for detection of CO and NO2 at room temperature

Disclosing Fast Detection Opportunities with Nanostructured Chemiresistor Gas Sensors Based on Metal Oxides, Carbon, and Transition Metal Dichalcogenides

Resistive Sensors for Continuous Monitoring of Air Pollution

Contact Info

Product

Resources

About

Ultra-Fast NO₂ Detection by MoS₂ Nanoflakes at Room Temperature

Atomically thin-layered WS₂ based resistive sensors for detection of CO and NO₂ at room temperature

Atomically thin-layered WS₂ based resistive sensors for detection of CO and NO₂ at room temperature