EDTA-Decorated Nanostructured ZnO/CdS Thin Films for Oxygen Gas Sensing Applications

Arunraja, L.; Thirumoorthy, P.; Karthik, A.; Rajendran, V.; Edwinpaul, L.

doi:10.1007/s11664-016-4629-8

Cited by 14 publications

(4 citation statements)

References 14 publications

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“…In sunlight, the visible light accounts for a large percentage, but is restricted by the band gap of ZnO (3.2 eV) [20], which could only utilize a fraction of ultraviolet light. light and shorter wavelength visible light.…”

Section: Resultsmentioning

confidence: 99%

“…[17,18]. In particular, modification of the p−n junction between the contact interfaces could induce electron injection from n-type to p-type semiconductor, and promote the separation of the photon-generated carriers under illumination [19], which could increase the photoelectric response efficiency, in materials such as CdS/ZnO [20], CuAlO 2 /ZnO [21], etc. [22,23].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

p–n junction induced electron injection type transparent photosensitive film of Cu₂O/carbon quantum dots/ZnO

Pan¹,

Zhao²,

Wei³

et al. 2018

Nanotechnology

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An electron injection type transparent photosensitive CuO/carbon quantum dot (C QD)/ZnO p-n junction film was prepared by a simple route in which, successively, the ZnO film was prepared by a sputtering process, the C QDs and CuO were prepared by hydrothermal synthetic and chemical methods, then the C QDs and CuO were introduced onto the surface of the ZnO film. The results indicated that the C QDs and CuO were well combined with the ZnO film. The transparency and photosensitivity of this film were investigated, and exhibited an obvious photosensitive enhancement compared with those of the unmodified film. Through analysis, this enhancement of the photoconductivity could be attributed to the remarkable CuO/ZnO p-n junction and C QDs with unique up-converted photoluminescence.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

p–n junction induced electron injection type transparent photosensitive film of Cu₂O/carbon quantum dots/ZnO

Pan¹,

Zhao²,

Wei³

et al. 2018

Nanotechnology

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“…Oxygen monitoring and quantification in gas mixtures and/or specific environments are of great significance in many fields, including life science and environmental quality, food storage, vacuum techniques, the automotive industry, the chemical industry, aerospace technology, and diving operations [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Real-time dynamic monitoring and quantification of oxygen over a wide range of concentrations is crucial for practical application.…”

Section: Introductionmentioning

confidence: 99%

Novel Au Nanoparticle-Modified ZnO Nanorod Arrays for Enhanced Photoluminescence-Based Optical Sensing of Oxygen

Zhang

et al. 2023

Sensors

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Novel optical gas-sensing materials for Au nanoparticle (NP)-modified ZnO nanorod (NR) arrays were fabricated using hydrothermal synthesis and magnetron sputtering on Si substrates. The optical performance of ZnO NR can be strongly modulated by the annealing temperature and Au sputtering time. With exposure to trace quantities of oxygen, the ultraviolet (UV) emission of the photoluminescence (PL) spectra of Au/ZnO samples at ~390 nm showed a large variation in intensity. Based on this mechanism, ZnO NR based oxygen gas sensing via PL spectra variation demonstrated a wide linear detection range of 10–100%, a high response value, and a 1% oxygen content sensitivity detection limit at 225 °C. This outstanding optical oxygen-sensing performance can be attributed to the large surface area to volume ratio, high crystal quality, and high UV emission efficiency of the Au NP-modified ZnO NR arrays. Density functional theory (DFT) simulation results confirmed that after the Au NPs modified the surface of the ZnO NR, the charge at the interface changed, and the structure of Au/ZnO had the lowest adsorption energy for oxygen molecules. These results suggest that Au NP-modified ZnO NR are promising for high-performance optical gas-sensing applications.

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“…The key factor in the design of a SAW gas sensor is the sensitive layer. In recent years, numerous materials including semiconducting metal oxides (TiO 2 , SnO 2 , ZnO, Pt-ZnO, Fe-ZnO), metal-organic framework materials and polymers, have been applied in oxygen gas sensors due to their high sensitivity and rapid response [14,15,16,17]. However, due to the poor stability and low sensitivity of the sensitive film [18], oxygen gas sensors for the high-temperature applications (>800 °C) were rarely reported.…”

Section: Introductionmentioning

confidence: 99%

The Investigation of High-Temperature SAW Oxygen Sensor Based on ZnO Films

et al. 2019

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In this paper, a wireless oxygen sensor based on a surface acoustic wave (SAW) was reported. For high-temperature applications, novel Al2O3/ZnO/Pt multilayered conductive film was deposited on langasite substrate as the electrodes, and ZnO film obtained by the pulse laser deposition (PLD) method was used as the sensitive film. The measurements of X-ray diffraction (XRD) and a scanning electron microscope (SEM) showed that the c-axis orientation of the ZnO grains and the surface morphology of the films were regulated by the deposition temperature. Meanwhile, the gas response of the sensor was strongly dependent on the surface morphology of the ZnO film. The experimental results showed that the oxygen gas sensor could operate at a high-temperature environment up to 850 °C with good stability for a long period. The max frequency shift of the sensors reaches 310 kHz, when exposed to 40% O2 gas at 850 °C. The calculated standard error of the sensors in a high-temperature measurement process is within 3%. Additionally, no significant signal degradation could be observed in the long-term experimental period. The prepared SAW oxygen gas sensor has potential applications in high-temperature sensing systems.

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EDTA-Decorated Nanostructured ZnO/CdS Thin Films for Oxygen Gas Sensing Applications

Cited by 14 publications

References 14 publications

p–n junction induced electron injection type transparent photosensitive film of Cu₂O/carbon quantum dots/ZnO

p–n junction induced electron injection type transparent photosensitive film of Cu₂O/carbon quantum dots/ZnO

Novel Au Nanoparticle-Modified ZnO Nanorod Arrays for Enhanced Photoluminescence-Based Optical Sensing of Oxygen

The Investigation of High-Temperature SAW Oxygen Sensor Based on ZnO Films

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EDTA-Decorated Nanostructured ZnO/CdS Thin Films for Oxygen Gas Sensing Applications

Cited by 14 publications

References 14 publications

p–n junction induced electron injection type transparent photosensitive film of Cu2O/carbon quantum dots/ZnO

p–n junction induced electron injection type transparent photosensitive film of Cu2O/carbon quantum dots/ZnO

Novel Au Nanoparticle-Modified ZnO Nanorod Arrays for Enhanced Photoluminescence-Based Optical Sensing of Oxygen

The Investigation of High-Temperature SAW Oxygen Sensor Based on ZnO Films

Contact Info

Product

Resources

About

p–n junction induced electron injection type transparent photosensitive film of Cu₂O/carbon quantum dots/ZnO

p–n junction induced electron injection type transparent photosensitive film of Cu₂O/carbon quantum dots/ZnO