Nanotubular Ta2O5 as ultraviolet (UV) photodetector

Talip, Mahzaton Aqma Abu; Khairir, Nur Samihah; Kadir, Rosmalini Ab; Mamat, M. H.; Rani, Rozina Abdul; Mahmood, Mohamad Rusop; Zoolfakar, Ahmad Sabirin

doi:10.1007/s10854-019-00792-5

Cited by 22 publications

(20 citation statements)

References 59 publications

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“…3(a) shows high homogeneity possessed of Ta2O5 nanotubular distribution formed at 50 000× magnifications. Similar to previous studies conducted using the same material and electrolyte composition for fabrication of UV sensor [17] and humidity sensor [27], the average diameter of the pores constructed in this study ranged from 15 to 20 nm as visualized in Fig 3(b) at 100 000× magnifications. The high homogeneity of Ta2O5 nanotubular achieved through anodization provides high surface area for the medium of interaction for H + ions interaction which facilitates the pH sensor mechanism.…”

Section: Surface Morphology By Field Emission Scanning Electron Micro...supporting

confidence: 82%

“…Tantalum anode and platinum cathode were anodized in electrolytes using the mixture of 50 ml ethylene glycol, 0.675 g of ammonium fluoride (NH4F), 0.25 ml of sulphuric acid (H2SO4), and 2 ml of distilled water. The composition of this anodization electrolyte has been optimized by a previous study that is capable to create Ta2O5 nanotubes on the surface of tantalum thin film [17]. Each sample was anodized at ambient temperatures with durations of 30 and 60 minutes.…”

Section: Fabrication Of Sensing Layer Via Anodization Synthesis Methodsmentioning

confidence: 99%

“…Meanwhile, synthesizing nanostructures through anodization offers great benefits because it does not require numerous steps and is easy to scale up. As the anodization parameter can be easily controlled, this method is capable to create different types of nanostructures such as nanowires [16], nanotubes [17], and nanodimpled [18].…”

mentioning

confidence: 99%

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Preliminary Study of pH Sensor for Engine Oil Deterioration Detection Using Anodized Ta2O5 Nanotubular

Ngadiman

Rani

Zulkifli

et al. 2022

IJIE

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pH sensor is one of the sensing principles that can be employed in detection of engine oil deterioration. To avoid unnecessary changing of engine oil while maintaining the oil quality consumed by car’s engine, engine oil deterioration sensor is required to continuously monitor the oil condition. In this work, we fabricated pH sensor sensing layer made up of tantalum thin film. Ta2O5nanotubular was constructed as the medium of interaction to measure the quality of engine oil. Anodization synthesis method was used to fabricate the sensing layer by varying the anodization time. Two samples anodized at 30 min and 60 min were tested in pH buffer solution at pH ranging from 2, 4, 7, 10 and 12. Further characterization using field emission scanning electron microscope (FESEM) was conducted to investigate the surface morphology properties, while X-ray diffraction (XRD) was conducted to obtain crystal properties of Ta2O5nanotubular. A homogeneous Ta2O5nanostructures with cubic crystal structure and pore diameter ranging between 15 to 20 nm was obtained. 30 min sample tested in pH buffer solution has better adsorption of H+ions with linear pH sensitivity of 31.616 mV/pH and good stability. Therefore, anodization method can be an alternative to fabricate pH sensor for oil deterioration detection system.Additionally, other study on chemical sensor for the detection of engine oil deterioration level wasalsodiscussed in this paper.

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Section: Surface Morphology By Field Emission Scanning Electron Micro...supporting

confidence: 82%

Section: Fabrication Of Sensing Layer Via Anodization Synthesis Methodsmentioning

confidence: 99%

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Preliminary Study of pH Sensor for Engine Oil Deterioration Detection Using Anodized Ta2O5 Nanotubular

Ngadiman

Rani

Zulkifli

et al. 2022

IJIE

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“…Zhan et al observed the activation of oxygen by hot electrons injected from Au into TiO 2 in Au/PATP/Au@TiO 2 NPs wherein the TiO 2 behaved as a charge transfer mediator . Molecular oxygen strongly adsorbs on the surfaces of oxygen-deficient wide-band-gap transition metal oxides such as TiO 2 , ZnO, and Ta 2 O 5 and is responsible for persistent photoconductivity in these materials. − …”

Section: Resultsmentioning

confidence: 99%

Nonlithographic Formation of Ta₂O₅ Nanodimple Arrays Using Electrochemical Anodization and Their Use in Plasmonic Photocatalysis for Enhancement of Local Field and Catalytic Activity

Kisslinger

Riddell

Manuel

et al. 2021

ACS Appl. Mater. Interfaces

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We demonstrate the formation of Ta 2 O 5 nanodimple arrays on technologically relevant non-native substrates through a simple anodization and annealing process. The anodizing voltage determines the pore diameter (25−60 nm), pore depth (2−9 nm), and rate of anodization (1−2 nm/s of Ta consumed). The formation of Ta dimples after delamination of Ta 2 O 5 nanotubes occurs within a range of voltages from 7 to 40 V. The conversion of dimples from Ta into Ta 2 O 5 changes the morphology of the nanodimples but does not impact dimple ordering. Electron energy loss spectroscopy indicated an electronic band gap of 4.5 eV and a bulk plasmon band with a maximum of 21.5 eV. Gold nanoparticles (Au NPs) were coated on Ta 2 O 5 nanodimple arrays by annealing sputtered Au thin films on Ta nanodimple arrays to simultaneously form Au NPs and convert Ta to Ta 2 O 5 . Au NPs produced this way showed a localized surface plasmon resonance maximum at 2.08 eV, red-shifted by ∼0.3 eV from the value in air or on SiO 2 substrates. Lumerical simulations suggest a partial embedding of the Au NPs to explain this magnitude of the red shift. The resulting plasmonic heterojunctions exhibited a significantly higher ensemble-averaged local field enhancement than Au NPs on quartz substrates and demonstrated much higher catalytic activity for the plasmon-driven photo-oxidation of paminothiophenol to p,p′-dimercaptoazobenzene.

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“…Based on the underlying UV detection mechanism, in this review article, we have classified UV sensors into two major categories: i)Photoelectric sensors that convert UV illumination into an electrical output—Semiconducting nanomaterials offer the opportunity to tune their bandgap in the UV region of the electromagnetic spectrum and are thus most commonly used in photoelectric UV sensor devices. In particular, metal oxide‐based semiconductors such as ZnO,16 TiO 2 ,17 Zn 2 SnO 4 ,18 ZnGa 2 O 4 ,19 ZnMgO,20 Zn 2 GeO 4 ,21 SnO,22 SnO 2 ,23 NiO,24 Nb 2 O 5 ,25 K 2 Nb 8 O 21 ,26 Ta 2 O 5 ,27 and Ga 2 O 3 ,28 have been widely studied. Additionally, other wide bandgap materials such as metal nitrides,29 metal sulfides,30 metal selenides,31 carbon‐based materials,32 and 2D analogs of graphene, such as phosphorene33 have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances and a Roadmap to Wearable UV Sensor Technologies

Zou

Sastry

Gooding

et al. 2020

Adv Materials Technologies

107

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The tremendous impact of UV radiation on every individual has resulted in massive interest in development of new sensor technologies to effectively monitor the solar exposure. However, there is no comprehensive review that critically discusses the advances made in the field of wearable UV sensor technologies and to position them as next‐generation mass‐deployable wearable devices. Herein, this gap is addressed by first classifying UV detection technologies into photoelectric and photochromic systems and summarizing their unique strengths and drawbacks. This is followed by a discussion on the integration of novel materials and design concepts with these technologies to develop wearable UV sensors. Then, the commercially available wearable UV sensors are examined thoroughly together with their limitations. Toward the end, a highly critical future outlook is provided, wherein the role of technological and regulatory interventions in assisting the development and integration of wearable UV sensors in the day‐to‐day activities is discussed. More importantly, the purpose of this review is not only to provide an in‐depth understanding of the underlying UV detection mechanism, design principles, and wearable technologies but also to act as a roadmap for those interested in the development and regulation of commercially deployable wearable UV sensors.

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Nanotubular Ta2O5 as ultraviolet (UV) photodetector

Cited by 22 publications

References 59 publications

Preliminary Study of pH Sensor for Engine Oil Deterioration Detection Using Anodized Ta2O5 Nanotubular

Preliminary Study of pH Sensor for Engine Oil Deterioration Detection Using Anodized Ta2O5 Nanotubular

Nonlithographic Formation of Ta₂O₅ Nanodimple Arrays Using Electrochemical Anodization and Their Use in Plasmonic Photocatalysis for Enhancement of Local Field and Catalytic Activity

Recent Advances and a Roadmap to Wearable UV Sensor Technologies

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Nanotubular Ta2O5 as ultraviolet (UV) photodetector

Cited by 22 publications

References 59 publications

Preliminary Study of pH Sensor for Engine Oil Deterioration Detection Using Anodized Ta2O5 Nanotubular

Preliminary Study of pH Sensor for Engine Oil Deterioration Detection Using Anodized Ta2O5 Nanotubular

Nonlithographic Formation of Ta2O5 Nanodimple Arrays Using Electrochemical Anodization and Their Use in Plasmonic Photocatalysis for Enhancement of Local Field and Catalytic Activity

Recent Advances and a Roadmap to Wearable UV Sensor Technologies

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Nonlithographic Formation of Ta₂O₅ Nanodimple Arrays Using Electrochemical Anodization and Their Use in Plasmonic Photocatalysis for Enhancement of Local Field and Catalytic Activity