Aligned hierarchical Ag/ZnO nano-heterostructure arrays via electrohydrodynamic nanowire template for enhanced gas-sensing properties

Yin, Zhouping; Wang, Xiaomei; Sun, Fuhua; Tong, Xiaohu; Zhu, Chen; Lv, Qiying; Ye, Dong; Wang, Shuai; Luo, Wei; Huang, Yuhang

doi:10.1038/s41598-017-12553-7

Cited by 44 publications

(31 citation statements)

References 44 publications

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“…The addition of noble metals, such as platinum (Pt) [18], palladium (Pd) [19], gold (Au) [20], and silver (Ag) [21,22], to the metal oxide structure can increase sensitivity and the selectivity. Weber et al [19] has revealed that through spillover effect, Pd can easily enhance the response of ZnO NWs gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZnO Flakes on Flexible Substrate and Its Application on Ethylene Sensing at Room Temperature

et al. 2019

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As a hormone that determinates the level of fruit ripeness, ethylene concentration monitoring plays an important role in the agricultural field. One of the techniques that can be used to detect ethylene concentration is the sensing method. Zinc oxide (ZnO) is a multipurpose metal oxide semiconductor with a wide application in sensing area. Here, we use a ZnO-based flexible sensor to identify the presence of ethylene gas at certain concentrations. The as-synthesized ZnO layers were deposited on a polyethylene terephthalate-indium doped tin oxide (PET-ITO) flexible substrate using a simple electrochemical deposition method. To enhance the performance of the ethylene sensor, a small amount of silver (Ag) was added to the seeding solution. From the study, it was revealed that the ZnO-Ag layers were able to identify the presence of ethylene gas at the lowest concentration of 29 ppm. The most optimal result was obtained using 1 mM Ag. This layer demonstrated a response of 17.2% and 19.6% of ethylene gas at concentrations of 29 and 50 ppm, with recovery times of four and eight minutes, respectively.

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Section: Introductionmentioning

confidence: 99%

Synthesis of ZnO Flakes on Flexible Substrate and Its Application on Ethylene Sensing at Room Temperature

et al. 2019

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“…The measured S values of Pd‐ZnO with the flow rate of 100 ppm were 1.62, 0.49, and −1.82 for H 2 , CO, and NO 2 , respectively. For the Ag‐decorated ZnO, the measured S values were 0.58, 0.19, and −0.85 for H 2 , CO, and NO 2 , respectively, explained via electron transport across the interfaces between the Ag and the ZnO . In case of SnO 2 NPs, the sensitivities toward the gases were lower than those of ZnO NPs‐based sensors, may be explained by the low surface‐to‐volume ratio of the SnO 2 NPs.…”

Section: Resultsmentioning

confidence: 95%

“…The analog signals obtained in the sensors were processed by the analog-to-digital converter (ADC) of the STM32L4 microcontroller unit (MCU) to be transmitted to the main server for pattern recognition. [51] In case of SnO 2 NPs, the sensitivities toward the gases were lower than those of ZnO NPs-based sensors, may be explained by the low surface-to-volume ratio of the SnO 2 NPs. As the frequency increased to 3 Hz, the charged voltage increased to 1.71 V, enough to supply continuous power to each sensor element of the array at the same time, although there was a small reduction in the voltage when the switch to sensors was turned on (Figure 8b).…”

Section: Resultsmentioning

confidence: 96%

High‐Output Triboelectric Nanogenerator Based on Dual Inductive and Resonance Effects‐Controlled Highly Transparent Polyimide for Self‐Powered Sensor Network Systems

Lee

Jung

Lee

et al. 2019

Advanced Energy Materials

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Internet of things (IoT), has triggered considerable interest in triboelectric nanogenerators (TENGs) as renewable and sustainable power sources, [1][2][3][4] owing to their high output power, [5,6] cost-effectiveness, [7] and high energy conversion efficiency. [8][9][10] The wide-availability and high functionality of TENGs offers itself to several practical applications. [11][12][13][14] Crucial to the successful implementation of TENGs in practical applications is to generate sufficient output power, usually stored in a capacitor or a battery, to operate the devices. [15][16][17][18] Strategies to enhance the output performance of TENGs are generally based on increasing of the transferred charge density between two contacted surfaces, as the electric potential is critically dependent on it. [19][20][21][22] Although the principle of contact-electrification has long been studied, [23][24][25] but whose mechanisms are still unclear. Recently, surface-states and electron cloud/potential models have been employed to explain the contact electrification mechanism. However, these models are limited to metal-semiconductors and metal-insulators, i.e., they may be not currently compatible with metal-polymers. [26,27] Other strategies have relied on the choice of materials in the triboelectric series with electronic and structural modifications, [28] such as a large work-function difference, [29,30] high porosity, [31,32] large dielectric constant, [33][34][35] and large surface roughness. [36][37][38] The maximum charge density of these TENGs in practical environments, however, requires additional processes, such as charges injection and poling process under high electric field. [35,[39][40][41] In particular, the injection process was quite efficient in increasing the charge density because it was considered to be limited by air breakdown. [38] Actually, the dielectric strengths of the polymers are larger than that of the air. The charge density was reached to 260 and 283 µC m −2 in TENGs with single-layered film and multilayered film, respectively. [40,41] Recently, several modifications to amplify the current flowing through the external circuit have been successfully demonstrated. [6,20,42] Metal-dielectric-metal structures or metal-metal contacts have been introduced, proven to increase the charge density of the TENG by several times.Since TENGs are driven by vibrations in the environment and human kinetics, the frequencies of the mechanical forces High-output triboelectric nanogenerators (TENGs) are demonstrated based on polyimide (PI)-based polymers by introducing functionalities (e.g., electronwithdrawing and electron-donating groups) into the backbone. The TENG based on 6FDA-APS PI, possessing the most negative electrostatic potential and the low-lying lowest unoccupied molecular orbital level, produces the highest effective charge density of about 860 µC m −2 in practical working conditions with the ion injection process. This may be ascribed to the excellent charge-retention characteristics as well as the enh...

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“…This behavior indicates that the Schottky barrier has formed at the metal-semiconductor contact. It is reported that the work function of ZnO (ϕ=5.2 eV) is larger than that of silver (ϕ=4.26 eV) [39]. Thus, the observed Schottky contact can be attributed to the differences between ZnO and Ag work functions [40].…”

Section: Optical Properties Of Zno Nanostructuresmentioning

confidence: 96%

Synthesis and Fabrication of ZnO Nanorods on Silicon for Methanol Gas Sensor

Faisal¹,

Jaleel²,

Kamal³

2019

ETJ

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Aligned hierarchical Ag/ZnO nano-heterostructure arrays via electrohydrodynamic nanowire template for enhanced gas-sensing properties

Cited by 44 publications

References 44 publications

Synthesis of ZnO Flakes on Flexible Substrate and Its Application on Ethylene Sensing at Room Temperature

Synthesis of ZnO Flakes on Flexible Substrate and Its Application on Ethylene Sensing at Room Temperature

High‐Output Triboelectric Nanogenerator Based on Dual Inductive and Resonance Effects‐Controlled Highly Transparent Polyimide for Self‐Powered Sensor Network Systems

Synthesis and Fabrication of ZnO Nanorods on Silicon for Methanol Gas Sensor

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