Synthesis of hydrophobic W18O49 nanorods for constructing UV/NIR-shielding and self-cleaning film

Zhong, Qiuping; Macharia, Daniel K.; Zhong, Wenjun; Liu, Zixiao; Chen, Zhigang

doi:10.1016/j.ceramint.2020.01.226

Cited by 21 publications

(10 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The XPS spectrum of the prepared W 18 O 49 thin film is displayed in Figure 5d. The W 4f peaks of the W 18 O 49 films are shifted toward higher binding energy, compared with the W 4f spectra of the as-deposited film, which confirms the formation of the high oxidation state of W (5 + , and 6 + ) [33,34]. The high-resolution XPS spectra of O 1s peaks of the as-fabricated sputtered W and W 18 O 49 films are demonstrated in Figure 5e,f.…”

Section: Resultsmentioning

confidence: 55%

Nanostructured Magnéli-Phase W18O49 Thin Films for Photoelectrochemical Water Splitting

et al. 2020

View full text Add to dashboard Cite

Converting water into hydrogen through the photo-electrochemical (PEC) process is one of the most exciting approaches in this field, and there is a quest to design or search for new electro-photo-catalytic materials. In this work, simple steps for fabrication and transformation of metallic tungsten thin film into the photo-active Magnéli-phase (W18O49) of tungsten oxide thin film is demonstrated. The post-annealing temperature has a significant impact on the phase evolution of tungsten film into W18O49. The film thickness of W18O49 is controlled by controlling the sputtering time (or deposition time) of W film. The PEC performance of the as-prepared electrodes is evaluated by monitoring the water oxidation reaction under visible radiation. The PEC findings reveal a correlation between PEC performance and phase, morphology, and thickness of the film. The as-derived W18O49 can efficiently catalyze the water oxidation reaction at neutral solution pH, generating 0.6 and 1.4 mA cm−1 photo-current at 0.6 and 0.8 V vs. Saturated calomel electrode (SCE), respectively, in addition to excellent stability. The electrical conductivity and the charge transfer kinetics are investigated employing the electrochemical impedance spectroscopic (EIS) technique.

show abstract

Section: Resultsmentioning

confidence: 55%

Nanostructured Magnéli-Phase W18O49 Thin Films for Photoelectrochemical Water Splitting

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Many transparent NIR filters are proposed to block the NIR solar radiation in recent years. [ 27–41 ] However, several NIR filters block the NIR solar radiation by absorption, [ 28–36 ] for example, W 18 O 49 , [ 28 ] Cu 2− x S/SiO 2 [ 29 ] and (NH4) x WO 3 , [ 32 ] which will increase the additional heating load as well. [ 33 ] To reduce the heating load, it is important to filter the NIR solar radiation by reflection.…”

Section: Introductionmentioning

confidence: 99%

“…[15,[19][20][21][22] General DPRC applications should selectively emit thermal radiation in the atmospheric window and minimize solar absorption, simultaneously. However, for transparent applications (e.g., transparent electrode, [23,24] display device, [25][26][27] and window [28][29][30][31] ), only visible light (0.38-0.78 µm) is allowed for view or illumination. The rest of the solar radiation (mainly NIR: 0.78-2.5 µm), if transmitted will cause overheating or additional energy for cooling.Many transparent NIR filters are proposed to block the NIR solar radiation in recent years.…”

mentioning

confidence: 99%

“…The rest of the solar radiation (mainly NIR: 0.78-2.5 µm), if transmitted will cause overheating or additional energy for cooling.Many transparent NIR filters are proposed to block the NIR solar radiation in recent years. [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] However, several NIR filters block the NIR solar radiation by absorption, [28][29][30][31][32][33][34][35][36] for example, W 18 O 49 , [28] Cu 2−x S/SiO 2 [29] and (NH4) x WO 3 , [32] which will increase the additional heating load as well. [33] To reduce the heating load, it is important to filter the NIR solar radiation by reflection.…”

mentioning

confidence: 99%

See 1 more Smart Citation

An Ultrathin Transparent Radiative Cooling Photonic Structure with a High NIR Reflection

Dang

Wang

2022

Adv Materials Inter

View full text Add to dashboard Cite

What's more, to make the DPRC devices economical and manufactured in large scale, polymers and microspheres are applied. [15,[19][20][21][22] General DPRC applications should selectively emit thermal radiation in the atmospheric window and minimize solar absorption, simultaneously. However, for transparent applications (e.g., transparent electrode, [23,24] display device, [25][26][27] and window [28][29][30][31] ), only visible light (0.38-0.78 µm) is allowed for view or illumination. The rest of the solar radiation (mainly NIR: 0.78-2.5 µm), if transmitted will cause overheating or additional energy for cooling.Many transparent NIR filters are proposed to block the NIR solar radiation in recent years. [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] However, several NIR filters block the NIR solar radiation by absorption, [28][29][30][31][32][33][34][35][36] for example, W 18 O 49 , [28] Cu 2−x S/SiO 2 [29] and (NH4) x WO 3 , [32] which will increase the additional heating load as well. [33] To reduce the heating load, it is important to filter the NIR solar radiation by reflection. [33][34][35][36][37][38][39][40][41] Such NIR reflecting filters can be realized by a conductive layer, [33][34][35][36][37][38][39][40][41] for example, ITO [37,40] and dielectric/metal/ dielectric (D/M/D) structure. [38,39,41] However, these NIR reflecting filters will also show high reflections (low emissions) within mid-infrared (MIR) bands, which suppress the radiative cooling. [37][38][39][40][41][42][43][44] As the radiative cooling power in 8-13 µm is significant, [1][2][3][4][5][6] the MIR radiation heat transfer between the cold sky and a NIR filter shouldn't be neglected. To realize high visible transmission, NIR reflection and MIR emission, simultaneously, one can combine a NIR reflecting filter (e. g., D/M/D [38][39][40][41][42][43][44] or ITO [37] ) and a transparent MIR emitting structure (e. g., SiO 2 [45,46] or PDMS [37,47] ). As a common visible transparent NIR reflecting film in energy saving, a D/M/D structure is often used as a spectrally selective filter that can transmit most of the visible light and reflect NIR solar radiation. [38][39][40][41][42][43][44][45][46] Dielectric layers can enhance visible transmission due to a destructive multi-reflective interference and a thin metal layer is responsible for NIR reflection, [38][39][40][41][42][43][44][45] which is higher than that of an ITO structure. [38] As a polymer, PDMS will age especially under sunlight [48,49] and it is much thicker than a SiO 2 based emitter. [45,46] As a potential material for transparent radiative cooling, silica is stable with high transmittance over most of the solar wavelength range and also exhibits a strong phononpolariton resonance in the wavelength range of 8-13 µm. [45,46] However, there is an emission dip within 8-13 µm for a silica layer. [45] With 2D silica photonic crystals [45] or gratings, [46] silica can show enhanced MIR emission. As a result, it is expected With a high NIR reflection, a transparent radiativ...

show abstract

“…However, most reported EC materials have narrow range of spectral absorption blocking only the entire visible light, if not, only specific wavelengths in the visible range allowing NIR transmissions. NIR attenuations observed in inorganic metal oxides such as vanadium oxide (VO 2 ), [28] antimony doped tin oxide, [29,30] tungsten suboxide (W 18 O 49 ), [31,32] cesium tungsten bronze (Cs x WO 3 ), [33,34] among others have been integrated to visible light absorbing In this work, active viologen anchored on poly(2-isopropyl-2-oxazoline) (PiPO) segments spaced with triazole-bearing oxyethylene chain (POE m -PiPO-HPV) molecule is discovered to be an effective single-component dual-band chromic material. Unlike most reported materials of this type, POE m -PiPO-HPV not only is electrochromic but thermochromic as well, showing optical switching from clear to hazy at ≈55-59 °C as a result of phase transformation when triggered by heat attaining >60% optical contrast (ΔT) both in the visible and near infrared (NIR) range.…”

mentioning

confidence: 99%

Electrically and Thermally Controllable Visible‐to‐Near‐Infrared Light Trapping Smart Window with Tunable Optical States

Puguan

Rathod

Kim

2022

Advanced Optical Materials

View full text Add to dashboard Cite

In this work, active viologen anchored on poly(2‐isopropyl‐2‐oxazoline) (PiPO) segments spaced with triazole‐bearing oxyethylene chain (POEm‐PiPO‐HPV) molecule is discovered to be an effective single‐component dual‐band chromic material. Unlike most reported materials of this type, POEm‐PiPO‐HPV not only is electrochromic but thermochromic as well, showing optical switching from clear to hazy at ≈55–59 °C as a result of phase transformation when triggered by heat attaining >60% optical contrast (ΔT) both in the visible and near infrared (NIR) range. Likewise, >75% ΔT is achieved when switched from clear state to colored state at an applied potential (≈0.45–2.9 V). Each distinct mode of chromism uniquely and autonomously modulates visible and NIR light. Multiple color states—hazy, burgundy, brown, dark purple, and royal blue—are also displayed when the spacer length is modified and when the counteranions undergo metathesis. A coloration speed of 25 s resulting in purple color and a bleaching speed of 11 s are attained by PiPO with hepta‐oxyethylene chain and hexafluorophosphate anion (POE7‐PiPO‐HPV‐PF6) with a coloration efficiency of 295.0 cm2 C−1 and cyclic stability of >200 cycles.

show abstract

Synthesis of hydrophobic W18O49 nanorods for constructing UV/NIR-shielding and self-cleaning film

Cited by 21 publications

References 47 publications

Nanostructured Magnéli-Phase W18O49 Thin Films for Photoelectrochemical Water Splitting

Nanostructured Magnéli-Phase W18O49 Thin Films for Photoelectrochemical Water Splitting

An Ultrathin Transparent Radiative Cooling Photonic Structure with a High NIR Reflection

Electrically and Thermally Controllable Visible‐to‐Near‐Infrared Light Trapping Smart Window with Tunable Optical States

Contact Info

Product

Resources

About