Anodization fabrication of 3D TiO2 photonic crystals and their application for chemical sensors

Wang, Gang; Wang, Jian; An, Yuying; Wang, Chengwei

doi:10.1016/j.spmi.2016.09.027

Cited by 30 publications

(20 citation statements)

References 19 publications

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“…The sensitivity of such a sensor is 360 nm/RIU, where RIU is a refractive index unit. It is worth noting, that the achieved value of the sensitivity is much higher than the corresponding value for ATO refractive index sensors (about 250 nm/RIU) reported earlier [11,15].…”

Section: Resultscontrasting

confidence: 59%

“…Among the variety of approaches to the preparation of photonic crystals (e.g., self-organization of colloidal particles [8,9] and holographic lithography [10]), the most promising method for synthesis of titanium oxide photonic crystals is the anodizing of titanium under periodic anodizing conditions [11,12,13,14,15,16,17,18]. Such an approach allows one to prepare a one-dimensional PC by varying the anodizing voltage or current density leading to the change of porosity, p , and as a result, modulation of an effective refractive index [19], n eff , throughout the film thickness.…”

Section: Introductionmentioning

confidence: 99%

“…Earlier, a new anodizing regime with voltage versus electric charge density modulation U ( q ) was proposed for the fabrication of high-quality one-dimensional photonic crystals [14]. The key advantage of this regime over the voltage versus time U ( t ) [11,20] and current density versus time j ( t ) [17,21] anodizing regimes is highly precise control of the layers thickness due to the in situ measuring of charge. However, values of n eff are required for the precise control of the OPL.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Titania Photonic Crystals with Precise Photonic Band Gap Position via Anodizing with Voltage versus Optical Path Length Modulation

et al. 2019

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Photonic crystals based on titanium oxide are promising for optoelectronic applications, for example as components of solar cells and photodetectors. These materials attract great research attention because of the high refractive index of TiO2. One of the promising routes to prepare photonic crystals based on titanium oxide is titanium anodizing at periodically changing voltage or current. However, precise control of the photonic band gap position in anodic titania films is a challenge. To solve this problem, systematic data on the effective refractive index of the porous anodic titanium oxide are required. In this research, we determine quantitatively the dependence of the effective refractive index of porous anodic titanium oxide on the anodizing regime and develop a model which allows one to predict and, therefore, control photonic band gap position in the visible spectrum range with an accuracy better than 98.5%. The prospects of anodic titania photonic crystals implementation as refractive index sensors are demonstrated.

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Section: Resultscontrasting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Titania Photonic Crystals with Precise Photonic Band Gap Position via Anodizing with Voltage versus Optical Path Length Modulation

et al. 2019

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“…The discovery of the latter effect facilitated the exploitation of catalytic TiO 2 properties in the design of sensors for gases and gaseous materials. Due to remarkable properties, many different TiO 2 -based structures have found applications in various technological areas including biosensors [4,5] and chemical sensors [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

TiO2-x/TiO2-Structure Based ‘Self-Heated’ Sensor for the Determination of Some Reducing Gases

Ramanavičius

Tereshchenko

Karpicz

et al. 2019

Sensors

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In this research we report the gas-sensing properties of TiO2-x/TiO2-based hetero-structure, which was ‘self-heated’ by current that at constant potential passed through the structure. Amperometric measurements were applied for the evaluation of sensor response towards ethanol, methanol, n-propanol and acetone gases/vapours. The sensitivity towards these gases was based on electrical resistance changes, which were determined by amperometric measurements of current at fixed voltage applied between Pt-based contacts/electrodes deposited on the TiO2-x/TiO2-based layer. X-ray diffraction (XRD) analysis revealed the formation of TiO2-x/TiO2-based hetero-structure, which is mainly based on Ti3O5/TiO2 formed during the hydro-thermal oxidation-based sensing-layer preparation process. Additionally, photoluminescence and time-resolved photoluminescence decay kinetics-based signals of this sensing structure revealed the presence of TiO2 mainly in the anatase phase in the TiO2-x/TiO2-based hetero-structure, which was formed at 400 °C annealing temperature. The evaluation of TiO2-x/TiO2-based gas-sensing layer was performed at several different temperatures (25 °C, 72 °C, 150 °C, 180 °C) and at these temperatures different sensitivity to the aforementioned gaseous materials was determined.

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“…The discovery of latter effect facilitated the exploitation of catalytic TiO2 properties in the design of sensors for gases and gaseous materials. Due to remarkable properties, many different TiO2-based structures have found applications in various technological areas including biosensors [4,5] and chemical sensors [6,7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

TiO<sub>2-x</sub>/TiO<sub>2</sub>-Structure Based ‘Self-Heated’ Sensor for the Determination of Some Reducing Gases

Ramanavičius¹,

Tereshchenko²,

Karpič³

et al. 2019

Preprint

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In this research we are reporting gas sensing properties of TiO2-x/TiO2-based hetero-structure, which was ‘self-heated’ by current that at constant potential passed through the structure. Amperometric measurements were applied for the evaluation of sensor response towards ethanol, methanol, n-propanol and acetone gases/vapors. The sensitivity towards these gases was based on electrical resistance changes, which were determined by amperometric measurements of current at fixed voltage applied between Pt-based contacts/electrodes deposited on TiO2-x/TiO2-based layer. XRD analysis revealed the formation of TiO2-x/TiO2-based hetero-structure, which is mainly based on Ti3O5/TiO2 formed during hydro-thermal oxidation based sensing layer preparation process. Additionally, photoluminescence and time-resolved photoluminescence decay kinetics based signals of this sensing structure revealed the presence of TiO2 mainly in the anatase phase in the TiO2-x/TiO2-based hetero-structure, which was formed at 400°C annealing temperature. The evaluation of TiO2-x/TiO2-based gas sensing layer was performed at several different temperatures (25°C, 72°C, 150°C, 180°C) and at these temperatures different sensitivity to aforementioned gaseous materials was determined.

show abstract

Anodization fabrication of 3D TiO2 photonic crystals and their application for chemical sensors

Cited by 30 publications

References 19 publications

Titania Photonic Crystals with Precise Photonic Band Gap Position via Anodizing with Voltage versus Optical Path Length Modulation

Titania Photonic Crystals with Precise Photonic Band Gap Position via Anodizing with Voltage versus Optical Path Length Modulation

TiO2-x/TiO2-Structure Based ‘Self-Heated’ Sensor for the Determination of Some Reducing Gases

TiO<sub>2-x</sub>/TiO<sub>2</sub>-Structure Based ‘Self-Heated’ Sensor for the Determination of Some Reducing Gases

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Anodization fabrication of 3D TiO2 photonic crystals and their application for chemical sensors

Cited by 30 publications

References 19 publications

Titania Photonic Crystals with Precise Photonic Band Gap Position via Anodizing with Voltage versus Optical Path Length Modulation

Titania Photonic Crystals with Precise Photonic Band Gap Position via Anodizing with Voltage versus Optical Path Length Modulation

TiO2-x/TiO2-Structure Based ‘Self-Heated’ Sensor for the Determination of Some Reducing Gases

TiO<sub>2-x</sub>/TiO<sub>2</sub>-Structure Based &lsquo;Self-Heated&rsquo; Sensor for the Determination of Some Reducing Gases

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About

TiO<sub>2-x</sub>/TiO<sub>2</sub>-Structure Based ‘Self-Heated’ Sensor for the Determination of Some Reducing Gases