Functional nanomaterials in flexible gas sensors: recent progress and future prospects

Lawaniya, Shiv Dutta; Kumar, Sanjay; Yu, Yeon–Tae; Rubahn, Horst‐Günter; Mishra, Yogendra Kumar; Awasthi, Kamlendra

doi:10.1016/j.mtchem.2023.101428

Cited by 43 publications

(27 citation statements)

References 280 publications

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“…These 2D materials can also be 3D printed onto flexible substrates or blended with the printing ink to create self-standing films to fabricate flexible gas sensors and form ultrathin and lightweight electronics. There are several works reported on flexible gas sensors (using graphene, rGO, MoS 2 , and so on) with wearable sensor modules where textile, paper, and polymer substrates were also used. , Therefore, there is a good chance of enhancing the device performance with flexible systems, as well.…”

Section: Resultsmentioning

confidence: 99%

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Hydrogen Sulfide Gas Detection Using Two-Dimensional Rhodonite Silicate

Mahapatra,

Campos de Oliveira,

Sreeram

et al. 2023

Chem. Mater.

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Hydrogen sulfide is a hazardous gas that is found in common industrial waste sources, including sewage and oil refineries; it is lethal at concentrations exceeding 100 ppm. Twodimensional (2D) oxide materials with a high surface area and environmental stability can be utilized for ultralow concentration gas sensing (H 2 S gas). Here, we demonstrate the gas sensing properties of two-dimensional rhodonite silicate (R-silicate) extracted from natural mineral ore. 2D R-silicate shows high sensitivity of up to 0.2 ppm −1 and high selectivity toward H 2 S compared to CO 2 , ethanol, acetone, and ammonia. The sensors developed using 2D R-silicate are found to be stable after five months. The high surface area and composition consisting of Mn atoms play a significant role in the sensing behavior. Ab initio computing simulations explain the mechanism of the selectivity of H 2 S over CO 2 using 2D R-silicate. The simulation also demonstrates the chemical interaction of H 2 S with the 2D surface of R-silicate, which is further supported by Raman spectroscopy. The findings of this study provide new opportunities for using environmentally stable natural silicate 2D materials as efficient replacements for conventional metal oxides for ultrasensitive sensors.

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Section: Resultsmentioning

confidence: 99%

“…There are several works reported on flexible gas sensors (using graphene, rGO, MoS 2 , and so on) with wearable sensor modules where textile, paper, and polymer substrates were also used. 25,26 Therefore, there is a good chance of enhancing the device performance with flexible systems, as well.…”

Section: O (Gas)mentioning

confidence: 99%

Hydrogen Sulfide Gas Detection Using Two-Dimensional Rhodonite Silicate

Mahapatra,

Campos de Oliveira,

Sreeram

et al. 2023

Chem. Mater.

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“…The interaction of the reducing gas (R) with the CuO surface results in a decrease in resistance. The kinetics of the reaction is as shown below. , normalO 2 ( air ) ↔ normalO 2 ( ads ) normalO 2 ( ads ) + normale − ↔ normalO 2 ( ads ) − normalO 2 ( ads ) − + normale − ↔ 2 normalO ( ads ) − normalR + normalO false( ads false) − ↔ RO + normale − …”

Section: Resultsmentioning

confidence: 99%

“…The interaction of the reducing gas (R) with the CuO surface results in a decrease in resistance. The kinetics of the reaction is as shown below. , …”

Section: Resultsmentioning

confidence: 99%

Defect-Induced Phase Transformations in CuO Thin Films by Ag Ion Implantation and Their Gas-Sensing Applications

et al. 2023

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The present study is aimed to modify the structural, optical, and morphological properties of CuO thin films with Ag ion implantation toward their potential applications. Fabrication of thin films of CuO was carried out using a thermal evaporation technique on silicon (Si) substrate; post implantation was done with 30 keV Ag ions with varying fluences from 1 × 1014 to 1 × 1016 ions/cm2. The pristine and implanted samples were characterized through X-ray diffraction (XRD), Raman spectroscopy, atomic force microscopy (AFM), and diffused reflectance spectroscopy (DRS). SRIM simulation was also carried out to understand the range and other effects. XRD measurements confirmed the formation of the CuO phase for pristine samples, and with the increase in ion fluence, the chemical composition changed from pure CuO to Cu2O + CuO and then to Cu2O + Cu at higher ion fluences. These experimental results from Raman spectroscopy were also consistent with the XRD analysis, which also showed the presence of mixed phases of CuO, Cu2O, and Cu. Results from AFM showed that the value of average roughness increased due to more defects. DRS results revealed the variation in band-gap energy for pristine and implanted samples from 1.96 to 1.71 eV. Density functional theory (DFT) simulations confirmed that Ag ion implantation causes the reduction of CuO surface into Cu2O and Cu. We found that Ag ion implantation-induced defects lead to the mixed phases of CuO, Cu2O, and Cu, which can help in the selective sensing of ethanol and acetone, demonstrating this as a useful technique and having potential applications in energy conversions, and gas and biomolecule sensing.

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“…13 Many transition metal oxides including CuO, NiO, ZnO, Co 3 O 4 , and MnO 2 have recently made significant contributions to nonenzymatic sensors. 14,15 Among these, ZnO has several unique features such as a wide band gap, excellent chemical characteristics, superior biocompatibility, 16 high isoelectric point (IEP), 17 non-toxicity, 18 fast electron transfer capability, 16,19 etc., along with optical, 17,20 electrical 21 and piezoelectric 22 and pyroelectric 23 properties. In spite of all these properties, the sensing properties of pristine ZnO are found to be inadequate.…”

Section: Introductionmentioning

confidence: 99%