Improvement of phase transition properties of magnetron sputtered W-doped VO2 films by post-annealing approach

Huang, Zhiyuan; Wu, Zhiming; Ji, Chunhui; Dai, Jinhong; Xiang, Zihao; Wang, Dan; Dong, Xiang; Jiang, Yadong

doi:10.1007/s10854-020-02964-0

Cited by 21 publications

(6 citation statements)

References 41 publications

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“…The detailed procedure is provided in the Methods section of the Supporting Information. The latter agreed well with the literature, showing that the reduction in the (011) interplanar distances led to an expanded band gap, finally increasing the luminous transmittance. − By combining the decomposition of PVP and difference in the annealing time, it can reasonably be inferred that the presence of residual carbon or the shorter annealing time would reduce the (011) interplanar distance and finally increase the optical band gap of the VO 2 films prepared by the PAD method (B2, C3).…”

Section: Results and Discussionsupporting

confidence: 89%

Facile Preparation of VO₂ Films with Enhanced Luminous Transmittance and Infrared Modulation Ability

Yang

Liu

Zeng

et al. 2021

ACS Appl. Electron. Mater.

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The facile preparation of cost-effective VO2 thin films with high luminous transmittance and outstanding infrared modulation ability is highly desirable but still challenging since the optimization of one aspect often comes at the expense of deterioration in another. Furthermore, the complexity of the doping process or design of composite films often increases the preparation cost and complicates the operation. In this work, the film thickness was adjusted by controlling the vanadium ion concentration of the sol and spin-coating parameters. The influence of the annealing time at various film thicknesses on the optical performance was examined. The results revealed that the thin film thicknesses of VO2 ranging from 100 to 120 nm showed outstanding optical performances with T lum,av = 36.9%, ΔT sol = 11.1%, and ΔT 2500 nm ≈ 70% (T lum,av is the average of luminous transmittance in the low/high-temperature phase). Short suitable annealing times were beneficial for expanding the optical band gap of the films, as well as increasing the porosity, thereby effectively enhancing the average luminous transmittance (T lum,av = 43.1%) and maintaining relatively high modulation ability (ΔT sol = 11.5%, ΔT 2500 nm = 65.1%). Overall, the proposed preparation method of highly compatible VO2 films simplifies the operation process and appears to be promising for a wide range of future applications, namely in visible-infrared zoom detection systems.

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Section: Results and Discussionsupporting

confidence: 89%

Facile Preparation of VO₂ Films with Enhanced Luminous Transmittance and Infrared Modulation Ability

Yang

Liu

Zeng

et al. 2021

ACS Appl. Electron. Mater.

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“…Other studies show that the MIT temperature range is relatively narrower. 47,48) The XPS analysis shows that the W element ununiformly distributes in the VO 2 films. The VO 2 grains containing different contents of W ions have different T c , and the MIT temperature range results from the contributions of all the elementary hysteresis cycles in each W-doped VO 2 grain.…”

Section: Electric Property Analysismentioning

confidence: 99%

Electrical and optical properties of highly crystalline W-VO₂ nano-films prepared by thermal oxidation of V-WO₃ precursors

Luo

Gong

Tian

et al. 2023

Jpn. J. Appl. Phys.

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Highly-crystalline W doped VO2 (W-VO2) nanofilms were obtained through a thermal oxidation of V-WO3 precursors, with their electric and optical properties being carefully studied. The W-VO2 films contain both rutile and monoclinic phases due to the decrease of phase transition temperature decrease and the ununiform distribution of W ions. It is seen that the W dopants greatly reduces the cool-state resistances and their apparent activation energy, indicating the they form donor levels. The electric analysis also shows that the W-VO2 films have the smooth metal-insulator transitions (MIT) across wide temperature range, with the MIT temperature, temperature coefficient of resistances, and hysteresis width being greatly reduced. The metallic phase contents are estimated from the temperature dependent transmittances, which shows an increase with the W contents at ambient temperatures. Due to the metallic phase and the conductance increase, the IR transmittances and solar modulation of the cool-state W-VO2 films becomes lower.

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“…Vanadium dioxide (VO 2 ) is a thermochromic material , that is widely used in optical storage, smart windows, laser protection, and photoelectric switch fields. − Due to its relatively high phase transition temperature (∼68 °C) and poor biocompatibility, , it is normally not suitable to be used in the biological field, while after doping tungsten (W) into VO 2 with a doping concentration of ∼4%, the phase transition temperature can be successfully reduced close to the human-body-temperature range, , as indicated in Scheme . After that, the W-VO 2 nanoparticles were coated with poly(ethylene glycol) (PEG) to enhance their dispersibility and biocompatibility.…”

Section: Resultsmentioning

confidence: 99%

Quantitative 3D Temperature Rendering of Deep Tumors by a NIR-II Reversibly Responsive W-VO₂@PEG Photoacoustic Nanothermometer to Promote Precise Cancer Photothermal Therapy

et al. 2023

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Accurately monitoring the three-dimensional (3D) temperature distribution of the tumor area in situ is a critical task that remains challenging in precision cancer photothermal (PT) therapy. Here, by ingeniously constructing a polyethylene glycol-coated tungsten-doped vanadium dioxide (W-VO 2 @PEG) photoacoustic (PA) nanothermometer (NThem) that linearly and reversibly responds to the thermal field near the human-body-temperature range, the authors propose a method to realize quantitative 3D temperature rendering of deep tumors to promote precise cancer PT therapy. The prepared NThems exhibit a mild phase transition from the monoclinic phase to the rutile phase when their temperature grows from 35 to 45 °C, with the optical absorption sharply increased ∼2-fold at 1064 nm in an approximately linear manner in the near-infrared-II (NIR-II) region, enabling W-VO 2 @PEG to be used as NThems for quantitative temperature monitoring of deep tumors with basepoint calibration, as well as diagnostic agents for PT therapy. Experimental results showed that the temperature measurement accuracy of the proposed method can reach 0.3 °C, with imaging depths up to 2 and 0.65 cm in tissue-mimicking phantoms and mouse tumor tissue, respectively. In addition, it was verified through PT therapy experiments in mice that the proposed method can achieve extremely high PT therapy efficiency by monitoring the temperature of the target area during PT therapy. This work provides a potential demonstration promoting precise cancer PT therapy through quantitative 3D temperature rendering of deep tumors by PA NThems with higher security and higher efficacy.

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Improvement of phase transition properties of magnetron sputtered W-doped VO2 films by post-annealing approach

Cited by 21 publications

References 41 publications

Facile Preparation of VO₂ Films with Enhanced Luminous Transmittance and Infrared Modulation Ability

Facile Preparation of VO₂ Films with Enhanced Luminous Transmittance and Infrared Modulation Ability

Electrical and optical properties of highly crystalline W-VO₂ nano-films prepared by thermal oxidation of V-WO₃ precursors

Quantitative 3D Temperature Rendering of Deep Tumors by a NIR-II Reversibly Responsive W-VO₂@PEG Photoacoustic Nanothermometer to Promote Precise Cancer Photothermal Therapy

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Improvement of phase transition properties of magnetron sputtered W-doped VO2 films by post-annealing approach

Cited by 21 publications

References 41 publications

Facile Preparation of VO2 Films with Enhanced Luminous Transmittance and Infrared Modulation Ability

Facile Preparation of VO2 Films with Enhanced Luminous Transmittance and Infrared Modulation Ability

Electrical and optical properties of highly crystalline W-VO2 nano-films prepared by thermal oxidation of V-WO3 precursors

Quantitative 3D Temperature Rendering of Deep Tumors by a NIR-II Reversibly Responsive W-VO2@PEG Photoacoustic Nanothermometer to Promote Precise Cancer Photothermal Therapy

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Facile Preparation of VO₂ Films with Enhanced Luminous Transmittance and Infrared Modulation Ability

Facile Preparation of VO₂ Films with Enhanced Luminous Transmittance and Infrared Modulation Ability

Electrical and optical properties of highly crystalline W-VO₂ nano-films prepared by thermal oxidation of V-WO₃ precursors

Quantitative 3D Temperature Rendering of Deep Tumors by a NIR-II Reversibly Responsive W-VO₂@PEG Photoacoustic Nanothermometer to Promote Precise Cancer Photothermal Therapy