Efficient charge-transport UV sensor based on interlinked ZnO tetrapod networks

Thepnurat, Meechai; Ruankham, Pipat; Phadunghitidhada, Surachet; Gardchareon, Atcharawon; Wongratanaphisan, Duangmanee; Choopun, Supab

doi:10.1016/j.surfcoat.2016.04.005

Cited by 8 publications

(5 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some researchers reported that enhanced charge separation can provide a progression in interfacial charge transfer for dyes adsorption and photocatalytic degradation improvement [29,30]. To improve UV photosensitivity and photocatalytic activity, this carrier concentration, carrier pathway, and charge recombination should be modified [31].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, several efforts have been made to improve carrier concentration, to provide alternative carrier pathway and reduce charge recombination by tuning ZnO morphology, surface defect improvement [31,32,33,34,35], and combining ZnO with other functional materials, such as carbon-based graphene oxide (GO) [13] and reduced graphene oxide (rGO) [36,37]. GO, rGO, and graphene consist of sp2 hybridized carbon atoms arranged in two-dimensional honeycomb lattices.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of GO Additive in ZnO/rGO Nanocomposites with Enhanced Photosensitivity and Photocatalytic Activity

et al. 2019

Self Cite

View full text Add to dashboard Cite

Zinc oxide/reduced graphene oxide nanocomposites (ZnO/rGO) are synthesized via a simple one-pot solvothermal technique. The nanoparticle–nanorod turnability was achieved with the increase in GO additive, which was necessary to control the defect formation. The optimal defect in ZnO/rGO not only increased ZnO/rGO surface and carrier concentration, but also provided the alternative carrier pathway assisted with rGO sheet for electron–hole separation and prolonging carrier recombination. These properties are ideal for photodetection and photocatalytic applications. For photosensing properties, ZnO/rGO shows the improvement of photosensitivity compared with pristine ZnO from 1.51 (ZnO) to 3.94 (ZnO/rGO (20%)). Additionally, applying bending strain on ZnO/rGO enhances its photosensitivity even further, as high as 124% at r = 12.5 mm, due to improved surface area and induced negative piezoelectric charge from piezoelectric effect. Moreover, the photocatalytic activity with methylene blue (MB) was studied. It was observed that the rate of MB degradation was higher in presence of ZnO/rGO than pristine ZnO. Therefore, ZnO/rGO became a promising materials for different applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of GO Additive in ZnO/rGO Nanocomposites with Enhanced Photosensitivity and Photocatalytic Activity

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Response (on/off) ratio or sensitivity is one of the key parameters of UV (and gas) sensors and was determined from resistance changes in ZnO samples tested in a dark chamber upon UV illumination. The sensitivity was calculated as:

, where R UV was the maximum resistance measured when the sensor was exposed to UV radiation and R dark was the resistance measured prior to exposure of UV radiation [ 21 ]. Figure 4 shows the typical response curves for both the bulk ZnO–MP and T–ZnO as well as of thin films in terms of resistance in the dark and under two different UV illuminations (UV A, 365 nm and UV B, 302 nm) with an intensity of 1.4–1.6 mW/cm 2 .…”

Section: Resultsmentioning

confidence: 99%

“…ZnO morphology has been shown to play a significant role in controlling the sensing performance. For example, ZnO nanofiber- and nanowire-based sensors were found to display high responsivity toward UV radiation in ambient conditions [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Development of Tetrapod Zinc Oxide-Based UV Sensor for Precision Livestock Farming and Productivity

et al. 2022

View full text Add to dashboard Cite

In order to ensure the health and welfare of livestock, there has been an emphasis on precision farming of ruminant animals. Monitoring the life index of ruminant animals is of importance for intelligent farming. Here, a wearable sensor for monitoring ultraviolet (UV) radiation is demonstrated to understand the effect of primary and secondary photosensitization on dairy animals. Thin films of wide bandgap semiconductor zinc oxide (ZnO) comprising multilevel of nanostructures from microparticles (MP) to nanoparticles (NP), and tetrapod (T-ZnO), were prepared as the UV sensing active materials. The sensitivity was evaluated by exposing the films to various radiation sources, i.e., 365 nm (UV A), 302 nm (UV B), and 254 nm (UV C), and measuring the electrical resistance change. T-ZnO is found to exhibit higher sensitivity and stable response (on/off) upon exposure to UV A and UV B radiation, which is attributed to their higher surface area, aspect ratio, porosity, and interconnective networks inducing a high density of chemical interaction sites and consequently improved photocurrent generation. A wearable sensor using T-ZnO is packaged and attached to a collar for dynamic monitoring of UV response on ruminant animals (e.g., sheep in this study). The excellent performance of T-ZnO wearable sensors for ruminant animals also holds the potential for a wider range of applications such as residential buildings and public spaces.

show abstract

“…[3][4][5][6][7][8] In recent years, photodetectors based on SAW devices have received extensive attention. [9][10][11] For example, Pang et al fabricated a LiTaO 3 -based Love mode SAW ultraviolet (UV) sensor with ZnO top layer, 12 which was operated at a resonant frequency of 41.5 MHz, with a frequency shi of 150 kHz under 254 nm UV radiation at 350 mW cm À2 Zhou et al used MoS 2 nanosheets as the UV-sensitive layer for SAW photodetectors, 8 which showed a maximum frequency shi of 3.5 MHz under a 365 nm UV illumination at a power density of 1.466 mW cm À2 . However, there are few reports about visible-light sensors or infrared sensors based on the SAW devices.…”

Section: Introductionmentioning

confidence: 99%

A high performance surface acoustic wave visible light sensor using novel materials: Bi₂S₃ nanobelts

Kan

Luo

et al. 2020

RSC Adv.

View full text Add to dashboard Cite

show abstract

Efficient charge-transport UV sensor based on interlinked ZnO tetrapod networks

Cited by 8 publications

References 13 publications

Effect of GO Additive in ZnO/rGO Nanocomposites with Enhanced Photosensitivity and Photocatalytic Activity

Effect of GO Additive in ZnO/rGO Nanocomposites with Enhanced Photosensitivity and Photocatalytic Activity

Development of Tetrapod Zinc Oxide-Based UV Sensor for Precision Livestock Farming and Productivity

A high performance surface acoustic wave visible light sensor using novel materials: Bi₂S₃ nanobelts

Contact Info

Product

Resources

About

Efficient charge-transport UV sensor based on interlinked ZnO tetrapod networks

Cited by 8 publications

References 13 publications

Effect of GO Additive in ZnO/rGO Nanocomposites with Enhanced Photosensitivity and Photocatalytic Activity

Effect of GO Additive in ZnO/rGO Nanocomposites with Enhanced Photosensitivity and Photocatalytic Activity

Development of Tetrapod Zinc Oxide-Based UV Sensor for Precision Livestock Farming and Productivity

A high performance surface acoustic wave visible light sensor using novel materials: Bi2S3 nanobelts

Contact Info

Product

Resources

About

A high performance surface acoustic wave visible light sensor using novel materials: Bi₂S₃ nanobelts