Fast-Response Room Temperature Hydrogen Gas Sensors Using Platinum-Coated Spin-Capable Carbon Nanotubes

Jung, Daewoong; Han, Maeum; Lee, Gil S.

doi:10.1021/am506578j

Cited by 71 publications

(42 citation statements)

References 69 publications

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“…[1][2][3] So far, considerable efforts have been applied to facilitate the oxygen ionosorption for enhancing the gas sensing performance and various strategies are adopted to manipulate oxygen absorption, such as changing morphologies, [4][5][6] changing sizes and dimensions of micro or nano materials, [7][8][9] and using catalysts 10,11 or UV-light irradiation. 12,13 Recently, oxygen vacancies have been found to play a critical role in inuencing the gas sensing process and determining the performance of gas sensors. For example, density functional theory (DFT) has been successfully employed to study the effect of oxygen deciency on the electronic and structural properties of sub-stoichiometric tungsten oxides (WO 3Àx ).…”

Section: Introductionmentioning

confidence: 99%

Improving gas sensing performance by oxygen vacancies in sub-stoichiometric WO_3−x

Shen

Peng

et al. 2019

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Improving gas sensing performance by oxygen vacancies in sub-stoichiometric WO_3−x

Shen

Peng

et al. 2019

RSC Adv.

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“…Recently, graphene and carbon nanotubes have been used to decorate metal oxides for optimizing the sensing performance at low temperatures . Some external complex components have been used to improve the desorption rate by gas flowing, annealing, high‐vacuum treating, and UV‐light illumination . However, it still remains a challenge for most established gas sensors to achieve high sensitivity and fast recovery, simultaneously, at a low operation temperature which is favorable for practical use.…”

mentioning

confidence: 99%

CuO/WO₃ Hybrid Nanocubes for High‐Responsivity and Fast‐Recovery H₂S Sensors Operated at Low Temperature

Sun

Zhang

et al. 2015

Part & Part Syst Charact

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www.particle-journal.com www.MaterialsViews.com COMMUNICATION pure WO 3 particles, which have a cubic or quasi-cubic shape with fl at and smooth surfaces and size range of 80-150 nm. The HR-TEM images in Figure 1 b,c suggest that the pure WO 3 nanoparticles are highly crystalline; the space of lattice fringe 0.365 nm corresponds to the d -spacing of monoclinic WO 3 (200) planes. When the CuO was incorporated, it is found that the faces become rough and irregular, as seen from the SEM and TEM images (Figure 1 d-f and Figure S1, Supporting Information). The irregular morphology becomes more apparent when the molar ratio of Cu:W was increased by adding more CuO precursor. The CuO nanoparticles form a coarse layer on the surface of WO 3 cubes. The CuO nanoparticle shell provides more defects and chemical active sites for the gas molecule adsorption. It is proposed that the (CH 3 COO) 2 Cu precursor is physically adsorbed on the surfaces of WO 3 nanocubes and then alcoholysis into Cu(OH) 2 during the hydrothermal process, which fi nally decomposes into CuO during annealing at 500 °C. The elemental mapping of O, W, and Cu distributions ( Figure 1 g-i) confi rmed the modifi cation of CuO nanoclusters on the surface of WO 3 nanocubes.Further characterization of the phase and composition was conducted using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The XRD patterns of the pure WO 3 nanocubes in Figure S2 (Supporting Information) can be indexed to the monoclinic WO 3 (JCPDS card no.43-1035), in agreement with the TEM result. With the molar ratio of Cu:W increasing to 1:5, the XRD peaks corresponding to CuO appeared (marked with a green square, JCPDS card no.48-1548). However, the presence of CuO was barely visible in the XRD curve when the molar ratio of Cu:W was below 1:20. Thus, XPS was further exploited to examine the surface chemical composition of the Cu:W = 1:20 sample (see Figure 2 ; and Figure S3, Supporting Information). The binding energies at 933.8 and 953.5 eV are attributed to Cu 2p 3/2 and Cu 2p 1/2 , respectively. Two satellite peaks at 963.4 and 942.5 eV might be related to the presence of Cu 2+ . [24][25][26] The binding energy of W 4f is observed at 37.8 eV (W 4f 5/2 ) and 35.7 eV (W 4f 7/2 ) in Figure 2 b, confi rming the state of W ion (W 6+ ) in WO 3 . All the results evidence the presence of O, W, and Cu elements.We employed the as-grown CuO/WO 3 hybrid nanoparticles to fabricate gas sensors for detecting H 2 S. We fi rst identifi ed the optimum composition by comparing a series of samples. Figure 3 a exhibits the temperature-dependent response on 4 ppm H 2 S of the devices made from different Cu/W molar ratios. The response of the sensor with 1:20 molar ratio is ≈270 000 at 55 °C, which is drastically higher than the devices with other Cu/W ratios. When the operating temperature Metal-oxide nanomaterials have a wide range of applications and are chemoresistive candidates for gas sensors used in the fi elds of environment monitoring, human safety, and national security. [1][2...

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“…Citric acid, sucrose, K + , Na + , Ca 2+ , maltose, and SO 4 2− at 0.1 mmol/L did not interfere with the determination of 1.0 µmol/L of caffeine. Table 2 presents a comparison between the results obtained by some Pt/CNTs [72][73][74]; Pd/CNTs [75]; Pt-Pd/CNTs [76]; Pd/CNT/rGO [77] 2% to 35% in the range 1% to 4% of H 2 CNT onto glass subs. Between Pd electrodes [56] 208% to 359% in the range 20 ppm to 1,000 ppm (100°C) H 2 Single and multiwalled CNT [78][79][80][81] 0.58% to 200% in the range 100 ppm to 80,000 ppm of the molecules and chemical sensors presented in this topic with other works previously reported (not discussed above).…”

Section: Molecules and Chemical Elementsmentioning

confidence: 99%

Carbon Nanostructure-based Sensors: A Brief Review on Recent Advances

Bezzon

Montanheiro

Menezes

et al. 2019

Advances in Materials Science and Engineering

122

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A brief review reporting the recent advances on the carbon nanostructured materials-based sensors covering recently published works is presented. Several works dealing with experimental and theoretical data are reviewed and discussed. The main results for carbon nanotubes, nanodiamonds, fullerene, graphene, and hybrid carbon-nanostructured devices that show sensing properties in different fields were considered for the discussions. The goal of this paper was to highlight sensor mechanisms, and the best results reached up to now are creating bases for further applications.

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Fast-Response Room Temperature Hydrogen Gas Sensors Using Platinum-Coated Spin-Capable Carbon Nanotubes

Cited by 71 publications

References 69 publications

Improving gas sensing performance by oxygen vacancies in sub-stoichiometric WO_3−x

Improving gas sensing performance by oxygen vacancies in sub-stoichiometric WO_3−x

CuO/WO₃ Hybrid Nanocubes for High‐Responsivity and Fast‐Recovery H₂S Sensors Operated at Low Temperature

Carbon Nanostructure-based Sensors: A Brief Review on Recent Advances

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Fast-Response Room Temperature Hydrogen Gas Sensors Using Platinum-Coated Spin-Capable Carbon Nanotubes

Cited by 71 publications

References 69 publications

Improving gas sensing performance by oxygen vacancies in sub-stoichiometric WO3−x

Improving gas sensing performance by oxygen vacancies in sub-stoichiometric WO3−x

CuO/WO3 Hybrid Nanocubes for High‐Responsivity and Fast‐Recovery H2S Sensors Operated at Low Temperature

Carbon Nanostructure-based Sensors: A Brief Review on Recent Advances

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Improving gas sensing performance by oxygen vacancies in sub-stoichiometric WO_3−x

Improving gas sensing performance by oxygen vacancies in sub-stoichiometric WO_3−x

CuO/WO₃ Hybrid Nanocubes for High‐Responsivity and Fast‐Recovery H₂S Sensors Operated at Low Temperature