A CuO–ZnO nanostructured p–n junction sensor for enhanced N-butanol detection

Chen, Yalu; Shen, Zhurui; Jia, Qi; Zhao, Jiang; Zhao, Zhe; Ji, Huiming

doi:10.1039/c5ra20031h

Cited by 53 publications

(25 citation statements)

References 76 publications

(101 reference statements)

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“…4b, for the pure In 2 O 3 NWs (S1 sample), only Mott-Schottky plots with a positive slope are observed, which is a distinct characteristic of n-type semiconductors 36 . After the introduction of Pt material, the typical ''V-shape'' (negative slope in the low potential range and positive slope in the higher potential range) is observed in the Mott-Schottky plots for the S2-S5 NW samples, demonstrating that some p-n junctions were established 37,38 . As proved by the XPS results, the peaks of Pt 4+ in the samples including Pt can be observed, indicating that a small amount of PtO 2 is formed.…”

Section: Resultsmentioning

confidence: 95%

A highly sensitive and moisture-resistant gas sensor for diabetes diagnosis with Pt@In2O3 nanowires and a molecular sieve for protection

et al. 2018

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Sensitive and selective detection of acetone in human exhaled breath plays an important role in the diagnosis of diabetes. However, obtaining a reliable response to ppb levels of acetone and avoiding cross-sensitivity due to the large amount of moisture in exhaled breath are still great challenges. In this work, a type of acetone sensor with ultrahigh sensitivity and moisture resistance is reported. Electrospun In 2 O 3 nanowires with a controllable Pt core (Pt@In 2 O 3 core-shell nanowires) are designed and prepared as sensitive layers. A mesoporous silica molecular sieve is further integrated as the moisture filter layer. The Pt@In 2 O 3 core-shell nanowire-based sensor exhibits a highly improved response compared with a sensor based on pure In 2 O 3 nanowires due to the probable increase in surface resistance and the introduction of p-n junctions after rational design of the structure. In addition, a good performance in terms of the fast dynamic process, selectivity and long-term stability is also achieved, and the detection limit can be as low as 10 ppb, which is much lower than the concentration level of 1.8 ppm in the exhaled breath of diabetic patients. The influence of the large amount of moisture is greatly weakened by using the molecular sieve as a moisture filter layer, leading to much improved sensitivity in clinical sample detection among healthy and diabetic patients. Based on the optimized composite structure of the Pt@In 2 O 3 core-shell nanowire sensor and moisture filter layer, a simple portable sensing prototype is successfully fabricated. The reported Pt@In 2 O 3 core-shell nanowires and the acetone sensing approach open up a new opportunity for a simple, inexpensive, and noninvasive diagnosis of diabetes.

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Section: Resultsmentioning

confidence: 95%

A highly sensitive and moisture-resistant gas sensor for diabetes diagnosis with Pt@In2O3 nanowires and a molecular sieve for protection

et al. 2018

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“…A range of strategies have been applied to ZnO and ZnO-based nanomaterials in an effort to enhance the gas sensing response (sensitivity), selectivity and repeatability, and to reduce the response and recovery times, including morphology control, doping, surface modification and decoration [7][8][9][10][11][12]. Of particular relevance to the present work, CuO decoration has been shown to substantially improve the gas sensing properties of pure ZnO nanomaterials, as exemplified by studies using CuO-ZnO nanorods [13,14], nanocorals [15], composite nanowires [16], ZnO nanostructured composites [17] and hierarchical nanostructures [18]. However, the typical size of these ZnO nanostructures is of the order of a 100 nm or more, and their comparatively small surface area to volume (S/V) ratio must limit their sensing properties.…”

Section: Introductionmentioning

confidence: 87%

Enhanced ethanol sensing properties of ultrathin ZnO nanosheets decorated with CuO nanoparticles

Liu

Sun

Wang

et al. 2018

Sensors and Actuators B: Chemical

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Ultrathin two-dimensional ZnO nanosheets (NSs) with thicknesses of just a few nanometers have been fabricated by a solvothermal method. The very large surface area to volume ratio of this material translates into outstanding electrical sensing responses to ethanol (as high as S 97 to 200 ppm of ethanol at a working temperature of 320 o C). Decorating these ZnO NSs with CuO nanoparticles (NPs), by pulsed laser ablation of a CuO target at room temperature and then post-annealing at 400 o C, yields CuO-ZnO NSs that display a further up to 2-fold enhanced response to ethanol vapour, reduced sensor response and recovery times, high sensing repeatability and high selectivity. Mechanism s underpinning the enhanced sensing properties of the CuO-ZnO NSs are discussed in terms of CuO NPinduced p-n junction depletion regions and increases in the density of active sites for ethanol adsorption and for reaction with adsorbed oxygen species.

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“…Chen et al [63] prepared by a two-step hydrothermal method a p-n junction ZnO-CuO nanostructure. In the first step, 2D porous ZnO nanosheets with exposed (0001) facets were assembled to form spheres.…”

Section: Ethanolmentioning

confidence: 99%

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Leonardi

2017

Chemosensors

153

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Two-dimensional (2D) nanomaterials, due to their unique physical and chemical properties, are showing great potential in catalysis and electronic/optoelectronic devices. Moreover, thanks to the high surface to volume ratio, 2D materials provide a large specific surface area for the adsorption of molecules, making them efficient in chemical sensing applications. ZnO, owing to its many advantages such as high sensitivity, stability, and low cost, has been one of the most investigated materials for gas sensing. Many ZnO nanostructures have been used to fabricate efficient gas sensors for the detection of various hazardous and toxic gases. This review summarizes most of the research articles focused on the investigation of 2D ZnO structures including nanosheets, nanowalls, nanoflakes, nanoplates, nanodisks, and hierarchically assembled nanostructures as a sensitive material for conductometric gas sensors. The synthesis of the materials and the sensing performances such as sensitivity, selectivity, response, and recovery times as well as the main influencing factors are summarized for each work. Moreover, the effect of mainly exposed crystal facets of the nanostructures on sensitivity towards different gases is also discussed.

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A CuO–ZnO nanostructured p–n junction sensor for enhanced N-butanol detection

Abstract: Herein, a novel CuO–ZnO nanostructured p–n junction composite is prepared via the hydrothermal method.

Cited by 53 publications

References 76 publications

A highly sensitive and moisture-resistant gas sensor for diabetes diagnosis with Pt@In2O3 nanowires and a molecular sieve for protection

A highly sensitive and moisture-resistant gas sensor for diabetes diagnosis with Pt@In2O3 nanowires and a molecular sieve for protection

Enhanced ethanol sensing properties of ultrathin ZnO nanosheets decorated with CuO nanoparticles

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

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