Gold functionalized MoO3 nano flakes for gas sensing applications

Arachchige, Hashitha M. M. Munasinghe; Zappa, Dario; Poli, Nicola; Gunawardhana, Nanda; Comini, Elisabetta

doi:10.1016/j.snb.2018.04.124

Cited by 68 publications

(23 citation statements)

References 36 publications

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Section: Morphological Designmentioning

confidence: 99%

“…For instance, some noble metals, such as Au [26,45,[96][97][98], Ag [99], Pt [100], and Pd [101], were reported to enhance gas sensors based on MoO 3 . These metals have a higher work functions of 5.1 [97,102], 4.72 [103], 5.6 [104], and 5.2 eV [105], respectively, compared to work function of MoO 3 that is 2.9 eV [106].…”

Section: Surface Functionalization With Noble Metalsmentioning

confidence: 99%

“…At this point, the measured resistance represents sensor resistance in the air ( R a ) [ 26 , 27 ]. When the target gas flows and comes into the sensor system, the sensor resistance changes due to the active reaction between ionized oxygen, releasing trapped electrons from the depleted region [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

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Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

et al. 2021

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Molybdenum-based materials have been intensively investigated for high-performance gas sensor applications. Particularly, molybdenum oxides and dichalcogenides nanostructures have been widely examined due to their tunable structural and physicochemical properties that meet sensor requirements. These materials have good durability, are naturally abundant, low cost, and have facile preparation, allowing scalable fabrication to fulfill the growing demand of susceptible sensor devices. Significant advances have been made in recent decades to design and fabricate various molybdenum oxides- and dichalcogenides-based sensing materials, though it is still challenging to achieve high performances. Therefore, many experimental and theoretical investigations have been devoted to exploring suitable approaches which can significantly enhance their gas sensing properties. This review comprehensively examines recent advanced strategies to improve the nanostructured molybdenum-based material performance for detecting harmful pollutants, dangerous gases, or even exhaled breath monitoring. The summary and future challenges to advance their gas sensing performances will also be presented.

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Section: Morphological Designmentioning

confidence: 99%

Section: Surface Functionalization With Noble Metalsmentioning

confidence: 99%

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Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

et al. 2021

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“…The 2-D materials are strong adsorbents to organic molecules, and at high temperatures, they tend to partially lose oxygen to become oxygen-deficient and so are considered as the most suitable candidates in VOCs sensing 144 . Among the various 2-D nanostructures of MoO3, the nanosheets 64,80,81,145 , nanoflakes [146][147][148] , nanoplates 79,149,150 , nanolamella 151 , nanopaper 152 , thin film [153][154][155][156] , microsheet 157 and microplanks 158 morphology of MoO3 have recently received great research interest in gas sensing applications as they can be used in designing nanodevices with desired crystal orientation due to their anisotropic structures. An overview of gas sensors based on 2-D MoO3 nanostructures is listed in Table 2.…”

Section: Two-dimensional (2-d) Moo3 Nanostructures For Gas Sensormentioning

confidence: 99%

“…The superior sensing response of the MoO3/SnO2 NFs was credited to the presence of large surface area, and n−n heterojunctions which favors the faster gas diffusion thus resulting in improving the H2S sensing performance. In another work, the group of Comini et al 148 utilized an evaporation-condensation method to prepare Au-loaded MoO3 NFks for detection of H2S gas. Owing to the smaller dimension and better separation, a large number of H2S molecules became absorbed on the surface of Au-MoO3 NFks, ultimately resulting in enhanced sensing performance.…”

Section: Moo3 Nanoflakes (Nfks)mentioning

confidence: 99%

Advances in the designs and mechanisms of MoO₃ nanostructures for gas sensors: a holistic review

2021

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Recent Progress in Chemiresistive Gas Sensing Technology Based on Molybdenum and Tungsten Chalcogenide Nanostructures

Jha

Bhat

2020

Adv Materials Inter

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bonding of transition metal and chalcogen atom and their crystal structure. Interestingly, all these compounds exist as layered material except tungsten oxide (WO 3 ) whose hydrated crystal (WO 3 .H 2 O) is layered in nature. [2,3] Each of these chalcogenides possesses unique features. Several micro and nanostructures of these chalcogenides have been synthesized in literature for various applications including gas sensors, biosensors, batteries, supercapacitor, photoelectrochemical and electrochromic devices. However, this review article will focus on gas sensing applications of these materials.Gas sensors play a crucial role in our life as they find applications ranging from monitoring indoor air quality to detecting highly toxic gases. Two important components of a gas sensing device are receptor and transducer. The receptor enables the chemical interaction with the target analyte molecule, which is further converted into analytical signal by the transducer. There are several transduction techniques available in gas sensing based on the physical or chemical change being measured. Broadly, they can be classified into six different classes based on sensing principles which is listed in Table 1.Chemiresistive devices have several advantages over other existing techniques. For example, the structure of these types of devices is very simple and it can be integrated with the current complementary metal oxide semiconductor (CMOS) technology. Even though, several advances have been made over last few years to improve sensing performance, the search for reliable and repeatable gas sensing element is an ongoing endeavor with lots of expectation from tungsten and molybdenum chalcogenides.After the rise of graphene, other layered materials have emerged as important functional materials for various applications of highest scientific values. Among these, layered transition metal dichalcogenides (TMDs) have a special presence as they cover whole class of materials, i.e., ranging from pure insulators to true metals. W and Mo chalcogenides are mostly semiconducting in ambient conditions and therefore, suitable for electronic application such as chemiresistive gas sensors. Though, layered TMDs (MX 2 M = Mo, and W and X = S, Se, and Te) have evolved expeditiously in a very short time, we simply cannot ignore metal oxide (particularly Mo-and W-based Chalcogens are oxygen family elements with oxygen having distinct properties than the other group members like sulfur, selenium, and tellurium. Tungsten and molybdenum chalcogenides that include mainly metal oxides (MO 3 ; M = Mo, and W) and metal dichalcogenides (MX 2 ; X = S, Se, and Te) are the most exciting class of inorganic materials. They have been widely investigated in various applications including lithium and sodium ion storage, supercapacitors, gas sensors, biosensors etc. due to their fascinating surface properties and ease of fabrication. Different class of nanostructures including 0D (nanoparticles, quantum dots), 1D (nanowires, nanotubes, nanoribbons, nanobelts etc.), a...

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Gold functionalized MoO3 nano flakes for gas sensing applications

Cited by 68 publications

References 36 publications

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

Advances in the designs and mechanisms of MoO₃ nanostructures for gas sensors: a holistic review

Recent Progress in Chemiresistive Gas Sensing Technology Based on Molybdenum and Tungsten Chalcogenide Nanostructures

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Gold functionalized MoO3 nano flakes for gas sensing applications

Cited by 68 publications

References 36 publications

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

Advances in the designs and mechanisms of MoO3 nanostructures for gas sensors: a holistic review

Recent Progress in Chemiresistive Gas Sensing Technology Based on Molybdenum and Tungsten Chalcogenide Nanostructures

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Advances in the designs and mechanisms of MoO₃ nanostructures for gas sensors: a holistic review