Selective epichlorohydrin-sensing performance of Ag nanoparticles decorated porous SnO<sub>2</sub>architectures

Zhang, Zhenglin; Song, Haiyan; Zhang, Shishu; Zhang, Junyan; Bao, Wenya; Zhao, Qiang; Wu, Xiang

doi:10.1039/c3ce41478g

Cited by 32 publications

(15 citation statements)

References 34 publications

(28 reference statements)

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“…A boost in the process of catalytic oxidation and chemical sensitization occurs due to the Ag 0 NPs resulting in an increase in the active oxygen species on the surface of the mAZCN sensor . As against the absence of Ag nanoparticles in mZCN, the presence of catalytic Ag nanoparticles in mAZCN assists in the breakdown of adsorbed acetone gas molecules due to the “spillover” effect . This increases the rate of interaction of analyte gas molecules with the sensor surface and results in an enhanced sensing response at lower operating temperatures.…”

Section: Resultsmentioning

confidence: 99%

Retracted: Ordered Mesoporous Ag–ZnO@g‐CN Nanohybrid as Highly Efficient Bifunctional Sensing Material

Malik

Tomer

Kienle

et al. 2018

Adv Materials Inter

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reversible interactions with the targeted analyte molecules. [3][4][5][6] The precise detection of relative humidity (%RH) in meteorology, weather forecasting, libraries, electronics, food processing, packaging, automobile industry, paper and textile technology, clinical diagnosis through breath monitoring, and agricultural field is continuously endorsing the interest in realizing promising %RH sensors. [7,8] While dealing with the noninvasive detection of volatile organic compounds (VOCs) in clinical diagnosis applications through breath monitoring, there always remains a challenge to distinctively detect specific biomarker (acetone for diabetes, ethanol for drunken driving, 1-butanol for skin cancer, formaldehyde for lung cancer, hydrogen sulfide for halitosis, and trimethylamine for trimethylaminuria) by reducing cross sensitivity to high humid contents of human breath (≈90%RH). [9][10][11][12][13] Researchers have been targeting highly efficient (excellent response, good linearity, short response/ recovery, and small hysteresis) multifunctional sensors utilizing numerous scientific and technological methods and exploring novel mesoporous materials with diverse morphologies. [14][15][16] In this context, mesoporous materials with high specific surface area and tunable pore diameter provide have proven out to be excellent solutions in designing sensing materials with extended multifunctionalities. [3][4][5][6]9,14] Graphitic carbon nitride (g-C 3 N 4 or g-CN), a metal-free polymer having structural resemblance with 2D layered graphite materials, has emerged out to be such a multifunction material. [17][18][19] For its extremely promising semiconducting, mechanical, optical, and chemical properties, g-CN has attracted much spotlight in bioimaging, photo(catalysis), water splitting, electrocatalysis, metal ions detection, and fuel cell applications. [20][21][22][23] Besides, the earth-abundant nature of its constituent elements (carbon and nitrogen) favors the low production cost of g-CN. [17,18] Yet, the very low surface area of g-CN (<15 m 2 g −1 ) offers multiple challenges in utilizing this fascinating material in "gas sensing technology" for which the basic need always remains the availability of high surface area. Materials with high surface area when used as sensor offer superior permeability and more active sites for the easier adsorption, transmission, and diffusion of charge carriers across the sensor The development of highly efficient and multifunctional sensors for accurately detecting indoor climate has always remained a challenging task. In this work, an important progress for nanocasting synthesis of ordered mesoporous Ag-ZnO-loaded graphitic carbon nitride (g-CN) prepared through template inversion of mesoporous silica, KIT-6, is presented. The cubic 3D ordered mesoporous Ag-ZnO@g-CN nanohybrid demonstrates excellent sensitivity, rapid response/recovery (5.1/2 s), excellent reversibility (0.3%), high stability, and negligible hysteresis (0.5%) to relative humidity (%RH) in the 11-98%RH range. Bes...

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Section: Resultsmentioning

confidence: 99%

Retracted: Ordered Mesoporous Ag–ZnO@g‐CN Nanohybrid as Highly Efficient Bifunctional Sensing Material

Malik

Tomer

Kienle

et al. 2018

Adv Materials Inter

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“…12,53 Furthermore, because of their large Helmholtz double layer, the metal nanoparticles become efficient electron sinks and hence Ag NPs acquired a tendency to form Ag 2 O compound in air and accelerated the formation of a more intense e – depleted layer when extracting the e – from meso -CN. 54 Besides, the lower work function of meso -CN (4.32) than that of Ag (4.26) causes e – to move from the meso -CN to the Ag NPs (Figure 8) and leads to the formation of a negative-charge layer around the Ag and meso -CN interface. 12,19 On exposure to reductive ethanol gas, e – moves back to the meso -CN via redox reaction between Ag 2 O and Ag and hence the regions adjacent to the Ag and meso -CN interface become highly sensitive for ethanol gas detection.…”

Section: Results and Discussionmentioning

confidence: 99%

Near-Room-Temperature Ethanol Detection Using Ag-Loaded Mesoporous Carbon Nitrides

Tomer

Malik²,

Kailasam

2017

ACS Omega

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Development of room-temperature gas sensors is a much sought-after aspect that has fostered research in realizing new two-dimensional materials with high surface area for rapid response and low-ppm detection of volatile organic compounds (VOCs). Herein, a fast-response and low-ppm ethanol gas sensor operating at near room temperature has been fabricated successfully by utilizing cubic mesoporous graphitic carbon nitride (g-CN, commonly known as g-C 3 N 4 ), synthesized through template inversion of mesoporous silica, KIT-6. Upon exposure to 50 ppm ethanol at 250 °C, the optimized Ag/g-CN showed a significantly higher response ( R a / R g = 49.2), fast response (11.5 s), and full recovery within 7 s in air. Results of sensing tests conducted at 40 °C show that the sensor exhibits not only a highly selective response to 50 ppm ( R a / R g = 1.3) and 100 ppm ( R a / R g = 3.2) of ethanol gas but also highly reversible and rapid response and recovery along with long-term stability. This outstanding response is due to its easily accessible three-dimensional mesoporous structure with higher surface area and unique planar morphology of Ag/g-CN. This study could provide new avenues for the design of next-generation room-temperature VOC sensors for effective and efficient monitoring of alarming concern over indoor environment.

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“…9 Whereas, Ag nanoparticles decorated porous SnO 2 architectures have also shown remarkable performance for sensing highly toxic industrial raw material such as Epichlorohydrin. 10 On the other hand, due to the multifunctional characteristics of CNTs, they have proved that they are one of the most promising materials for their incorporation into metal, ceramics and polymer matrix. 11 Therefore, intensive research activities have been focused for developing advance sensing materials based on CNTs.…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide-Multi Walled Carbon Nanotubes Nanocomposites for Carbon Monoxide Gas Sensor Application

Alharbi¹,

Ansari²,

Salah³

et al. 2016

j nanosci nanotechnol

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Zinc oxide (ZnO)/multi walled carbon nanotubes (MWCNTs) composites based sensors with different ZnO concentrations were fabricated to improve carbon monoxide (CO) gas sensing properties in comparison to the sensors based on bare MWCNTs. To study the structure, morphology and elemental composition of the resultant products, X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM) and Energy dispersive X-ray spectroscopy (EDS) were carried out. It has been observed that as the concentration of ZnO is increased more and more ZnO nanoparticles in the form of nodes get attached to MWCNTs resulting the reduction in average diameter of MWCNTs. The typical response of ZnO/MWCNTs composites based gas sensors for different CO concentrations (40, 100, 140 and 200 ppm) was studied by using very advanced sensing setup attached to I-V measurement system. Different sensing parameters such as: resistive response, sensitivity and response time were estimated at room temperature for all the fabricated sensors. The results indicated that the sensor based on nanocomposite which has 30 mg ZnO dispersed on 20 mg MWCNTs showing highest sensitivity and fastest response. All the sensors showed response times ranging from 8 to 23 seconds. The sensing mechanism behind the sensors based on ZnO/MWCNTs nanocomposites for CO gas at room temperature is also discussed in the present report.

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Selective epichlorohydrin-sensing performance of Ag nanoparticles decorated porous SnO₂architectures

Cited by 32 publications

References 34 publications

Retracted: Ordered Mesoporous Ag–ZnO@g‐CN Nanohybrid as Highly Efficient Bifunctional Sensing Material

Retracted: Ordered Mesoporous Ag–ZnO@g‐CN Nanohybrid as Highly Efficient Bifunctional Sensing Material

Near-Room-Temperature Ethanol Detection Using Ag-Loaded Mesoporous Carbon Nitrides

Zinc Oxide-Multi Walled Carbon Nanotubes Nanocomposites for Carbon Monoxide Gas Sensor Application

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Selective epichlorohydrin-sensing performance of Ag nanoparticles decorated porous SnO2architectures

Cited by 32 publications

References 34 publications

Retracted: Ordered Mesoporous Ag–ZnO@g‐CN Nanohybrid as Highly Efficient Bifunctional Sensing Material

Retracted: Ordered Mesoporous Ag–ZnO@g‐CN Nanohybrid as Highly Efficient Bifunctional Sensing Material

Near-Room-Temperature Ethanol Detection Using Ag-Loaded Mesoporous Carbon Nitrides

Zinc Oxide-Multi Walled Carbon Nanotubes Nanocomposites for Carbon Monoxide Gas Sensor Application

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Selective epichlorohydrin-sensing performance of Ag nanoparticles decorated porous SnO₂architectures