Improving ZnO Nanorod Humidity Sensors with Pt Nanoparticle Adsorption

Chu, Yen-Lin; Young, Sheng-Joue; Ding, Ran; Chu, Tung-Te; Lu, Ting-Sung; Ji, Liang‐Wen

doi:10.1149/2162-8777/abeb53

Cited by 25 publications

(10 citation statements)

References 56 publications

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“…In fact, noble metals are well-known for their catalytic activities and ability of modifying the adsorption/desorption on metal oxides of different gases as well as of water vapor [25]. Noble metal surface doping can produce active sites on the surface offering reaction pathways with small activation energies enhancing the reaction rates.…”

Section: Sensing Mechanismmentioning

confidence: 99%

The Effect of Au Nanoparticle Addition on Humidity Sensing with Ultra-Small TiO2 Nanoparticles

et al. 2021

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In this paper, we investigate humidity sensing through impedance measurements with TiO2 nanoparticles (about 6 nm in diameter). The transient behavior and the impedance spectra are measured and interpreted from the theoretical point of view. Large responses are shown especially in the relative humidity range from 30% to 80%, which are essentially explained by condensation in the nanopores. The effect of the addition of Au nanoparticles is investigated and as expected, the Au/TiO2 interfaces allow for dramatically reducing the sensing film response time and above all, its recovery time; moreover, it seems to favor condensation when the relative humidity overcomes 70%.

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Section: Sensing Mechanismmentioning

confidence: 99%

The Effect of Au Nanoparticle Addition on Humidity Sensing with Ultra-Small TiO2 Nanoparticles

et al. 2021

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“…The requirements for materials that make them suitable for moisture measurement, and consequently, for use in humidity sensors, were listed by Kamekichi and Tatsumi [2], and are, primarily, high sensitivity, fast response time, long-term durability, reproducibility, low cost, low hysteresis loop and operation over a wide range of RH and temperatures. To date, several types of humidity sensors have been developed [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

Mendes

Kurapova

Faia

et al. 2022

J Solid State Electrochem

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Humidity sensors are in high demand for many applications, such as environmental monitoring and air and food quality control. Despite many inorganic and organic materials exhibit moisture sensing properties, the electrical response of many existing sensors is not stable along the time. Polyantimonic acid (PAA) is characterized by elevated proton conductivity and by high thermal stability: consequently, it is seen as promising proton conductor for usage in humidity sensing devices. In this work, for the first time, PAA-based bulk solid membranes were produced and tested as potential materials for relative humidity (RH) detection and their moisture sensitivity was evaluated. Two different amounts of binder were used for moulding the solid sensors: the ones with 10% of binder were designated as 90PAA, while the ones with 20% were named 80PAA. The structures of the solid samples were investigated by X-ray diffraction (XRD) technique, adsorption–desorption curves via Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) techniques. The electrical behaviour was examined at ambient temperature by electrical impedance spectroscopy in the entire relative humidity (RH) interval (0–100%) and in the frequency range of 40 Hz up to 60 MHz. Electrical response of the materials was correlated with the structural features of the membranes. Both 90PAA and 80PAA sensors showed total resistance 3 × 105 and 3.5 × 105 Ω at 10% RH, respectively. A linear decrease of the resistance on RH was observed in the range 30–90% RH for both sensors. The electrical response of the evaluated PAA-based sensors displays good repeatability and reproducibility: the ones with lower binder content showed higher moisture sensitivity as well as very good time stability over 1 year.

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“…All samples showed a sharp UV emission (near band edge, NBE) at approximately 380 nm (3.26 eV), which is related to the recombination of free excitons . Another emission is in the broad visible green emission, which originated from the electron–hole recombination (deep-level emission, DLE) located at approximately 450–700 nm and associated with some intrinsic oxygen vacancies or defects of the ZnO structure {e.g., interstitial Zn (Zn i ), interstitial O (O i ), O vacancy (V O ), and Zn vacancy (V Zn )}. − As a result, it can be seen that the defects of AZO-0 NRs after Al-doping are reduced, because doped Al can effectively combine with oxygen atoms, and the oxygen vacancy region is improved, which can enhance the free electron density …”

Section: Resultsmentioning

confidence: 99%

Enhanced Nanogenerator Performances of 1-D Al-Doped ZnO Nanorod Arrays through Ultrasonic Wave Systems

Chu

Young

Chang

et al. 2023

ACS Appl. Electron. Mater.

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One-dimensional (1-D) well-aligned zinc oxide (ZnO) nanorods (NRs) without and with aluminum (Al) dopants were triumphantly grown on conductive indium−tin-oxide glass substrates through a simple chemical bath deposition at low temperature in this study. The designed devices are also called the AZO-0 and AZO-1 samples. After annealing in a vacuum state (10 min, 600 °C), the optical properties of the nanostructures were explored via photoluminescence emission spectroscopy. Field-emission scanning electron microscopy, high-resolution transmission electron microscopy, and an X-ray diffraction spectrometer were used to investigate the surface nanostructures and crystalline properties of the NR arrays. It was seen that all nanostructures clearly showed a single-crystal property with hexagonal wurtzite shape and grew vertically on the substrate. The elemental content of the sample was checked by X-ray photoelectron spectroscopy and an energy-dispersive X-ray spectrometer. Additionally, nanogenerators (NGs) based on the 1-D AZO-0 and AZO-1 nanostructures were also fabricated and investigated. The copper tape was successfully utilized to combine nanostructures and electrodes for the NG device in an ultrasonic oscillator machine with a water chamber. As a result, it was found that the output power values of the AZO-1 NR NGs were higher than that of the AZO-0 NR NGs. The AZO-1 NRs revealed significantly superior conductive performance in NG devices and are promising candidates in future self-powered NG applications.

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Improving ZnO Nanorod Humidity Sensors with Pt Nanoparticle Adsorption

Cited by 25 publications

References 56 publications

The Effect of Au Nanoparticle Addition on Humidity Sensing with Ultra-Small TiO2 Nanoparticles

The Effect of Au Nanoparticle Addition on Humidity Sensing with Ultra-Small TiO2 Nanoparticles

Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

Enhanced Nanogenerator Performances of 1-D Al-Doped ZnO Nanorod Arrays through Ultrasonic Wave Systems

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