V-groove SnO<sub>2</sub>nanowire sensors: fabrication and Pt-nanoparticle decoration

Sun, Guang–Zhen; Choi, Sun-Woo; Jung, Sung‐Hyun; Katoch, Akash; Kim, Sang Sub

doi:10.1088/0957-4484/24/2/025504

Cited by 29 publications

(24 citation statements)

References 23 publications

(31 reference statements)

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“…9 To circumvent such drawbacks involved in single-oxide NW sensors, multiply networked oxide NWs have been synthesized and proved to be excellent sensor platforms. 10,11 Various attempts have been made to further improve the sensing performance of multiply networked oxide NWs. [12][13][14][15][16][17][18][19][20][21] The application of core-shell (C-S) heterostructures has been found to be beneficial for enhancing sensing capabilities of nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Chemiresistive Sensing Behavior of SnO₂ (n)–Cu₂O (p) Core–Shell Nanowires

Kim

Katoch

Kim

et al. 2015

ACS Appl. Mater. Interfaces

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We report the synthesis of SnO2-Cu2O n-p core-shell nanowires (C-S NWs) and their use as chemiresistive sensors for detecting trace amounts of gas. The n-p C-S NWs were synthesized by a two-step process, in which the core SnO2 nanowires were prepared by the vapor growth technique and subsequently the Cu2O shell layers were deposited by atomic layer deposition. A systematic investigation of the sensing capabilities of the n-p C-S NWs, particularly as a function of shell thickness, revealed the underlying sensing mechanism. The radial modulation of the hole-accumulation layer is intensified under shells thinner than the Debye length. On the other hand, the contribution of volume fraction to resistance modulation is weakened. By the combination of these two effects, an optimal sensing performance for reducing gases is obtained for a critical p-shell thickness. In contrast, the formation of p-shell layers deteriorates the NO2-sensing performance by blocking the expansion of the hole-accumulation layer due to the presence of p-n heterointerface.

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Section: Introductionmentioning

confidence: 99%

Chemiresistive Sensing Behavior of SnO₂ (n)–Cu₂O (p) Core–Shell Nanowires

Kim

Katoch

Kim

et al. 2015

ACS Appl. Mater. Interfaces

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“…Accordingly, in the initial stages of the research on gas sensors using oxide NWs, various noble metals such as Pt, Pd, Au, and Ag have been loaded to explore the possibility of enhancing the gas-sensing characteristics. Representative literature results are summarized in Table 1 [54,55,56,57,58,59,60,61,62,63,64,65,66,67,68]. Noble metals are primarily known to enhance the gas response either by “electronic sensitization” or “chemical sensitization”.…”

Section: Physicochemical Modifications For the Enhancement Of Selementioning

confidence: 99%

“…In NW-based gas sensors, the loading of Pt is known to enhance the selectivity of SnO 2 NW sensors to NO 2 , toluene, and H 2 [54,55,56], while Pt-loaded ZnO-based NW gas sensors showed selective detection of C 2 H 5 OH [57]. The loading of Pt enhanced the response of In 2 O 3 NW sensors to O 2 and H 2 [58,59].…”

Section: Physicochemical Modifications For the Enhancement Of Selementioning

confidence: 99%

Design of Highly Selective Gas Sensors via Physicochemical Modification of Oxide Nanowires: Overview

Woo

Lee

2016

Sensors

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Strategies for the enhancement of gas sensing properties, and specifically the improvement of gas selectivity of metal oxide semiconductor nanowire (NW) networks grown by chemical vapor deposition and thermal evaporation, are reviewed. Highly crystalline NWs grown by vapor-phase routes have various advantages, and thus have been applied in the field of gas sensors over the years. In particular, n-type NWs such as SnO2, ZnO, and In2O3 are widely studied because of their simple synthetic preparation and high gas response. However, due to their usually high responses to C2H5OH and NO2, the selective detection of other harmful and toxic gases using oxide NWs remains a challenging issue. Various strategies—such as doping/loading of noble metals, decorating/doping of catalytic metal oxides, and the formation of core–shell structures—have been explored to enhance gas selectivity and sensitivity, and are discussed herein. Additional methods such as the transformation of n-type into p-type NWs and the formation of catalyst-doped hierarchical structures by branch growth have also proven to be promising for the enhancement of gas selectivity. Accordingly, the physicochemical modification of oxide NWs via various methods provides new strategies to achieve the selective detection of a specific gas, and after further investigations, this approach could pave a new way in the field of NW-based semiconductor-type gas sensors.

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“…It is well established that the performance of SnO 2 -based devices can be enhanced by employing sensing elements based on heterostructures [3][4][5][6][7] or by decorating the metal oxide with catalytic noble metal additives 8,9 including Pt nanoparticles. [10][11][12][13][14] In a similar way, different SnO 2 -Pt nanomaterial configurations were employed to promote chemical reactions in (electro-) catalysis. [15][16][17][18] Previous reports correlating the chemoresistive response of Pt-doped SnO 2 thick film devices with spectroscopy results 19,20 provided crucial insights into the underlying mechanisms of gas-solid interactions.…”

Section: Introductionmentioning

confidence: 99%