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result(s) for
"Ding, Hanming"
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Sandwich structure silver nanowires transparent conductive films with improved photoelectronic performance
Silver nanowires (AgNWs) are a promising substitute for indium tin oxide (ITO) transparent conductive films (TCFs). However, AgNWs suffer the insufficiencies in contact resistance between the nanowires and light loss. Here, graphene oxide and moth-eye-like antireflection nanostructure have been introduced to physically “weld” the AgNWs junctions and modulate the AR properties, respectively. The sandwich structure AgNWs TCFs achieved resistance of 26.26 Ω sq
−1
and transmittance of 98.67%, exhibiting promoted photoelectronic performance compared with the pure AgNWs films. The stability of sandwich structure AgNWs TCFs was improved, and their wettability was also discussed with water contact angle changed from 92.55° to 69.18°, switched from hydrophobic to hydrophilic. Though a simple solution process without mechanical or heat post-treatment, we proposed a stable sandwich structure to obviously improve the electrical and optical capabilities of AgNWs. The enhanced AgNWs TCFs with superior photoelectronic performance are believed to boost the practical applications and future development of AgNWs-based TCFs.
Journal Article
Improved structural stability of titanium-doped β-Bi2O3 during visible-light-activated photocatalytic processes
Due to its strong absorption to visible light and intrinsic polarizability, β-Bi
2
O
3
could be a promising candidate for the visible-light-activated photocatalysis. However, its structural instability during a photocatalytic process prevents it from being used practically. In this work, titanium-doped β-Bi
2
O
3
was synthesized by a hydrothermal method with subsequent calcination under 400 °C. Its crystal structure, photophysical property, and structural stability were investigated by using powder X-ray diffraction, Raman, infrared and diffuse reflectance UV–vis spectroscopies. The crystal structure of the titanium-doped β-Bi
2
O
3
is analogous to β-Bi
2
O
3
. These two oxides exhibited comparable photocatalytic activities on the photodegradation of indigo carmine, rhodamine B, and methylene blue under visible-light irradiation. However, unlike β-Bi
2
O
3
, the titanium-doped β-Bi
2
O
3
was quite stable during these photocatalytic reactions. The improvement in structural stability was attributable to the substitution of titanium species in the host crystal lattice. The current investigation results point toward the possibility of metal ion-doped bismuth oxides as efficient visible-light-activated photocatalysts.
Journal Article
Waste-Free and Highly Effective Catalytic System for the Oxidation of Cysteine to Cystine
A new three-component catalytic system, water/ionic liquid/metal phthalocyanine complex, was studied for the oxidition of cysteine to prepare cystine. It was found that the water/ 1-n-hexyl-3-methylimidazolium tetrafluoroborate ([hmim][BF₄])/iron (II) phthalocyanine (FeIIPc) system exhibited an excellent catalytic activity in the oxidition of cysteine. Cystine was obtained with 98% isolated yield in 12 h at the temperature of 80 °C. Further more, the catalytic system can be easily recovered and recycled in the following run without apparent reduction in catalytic activity. Graphical Abstract A novel homogeneous and recyclable catalytic system was applied in the selective oxidation of cysteine to cystine with clean, inexpensive molecular oxygen as oxidant. [graphic removed]
Journal Article
Ag2S/Bi2S3 co-sensitized TiO2 nanorod arrays prepared on conductive glass as a photoanode for solar cells
TiO
2
nanorod arrays (TiO
2
NRAs) were synthesized through a hydrothermal method. Ag
2
S and Bi
2
S
3
were then grown on the surface of TiO
2
NRAs with successive ionic layer adsorption and reaction method. The pristine rutile TiO
2
NRAs, Ag
2
S/TiO
2
, Bi
2
S
3
/TiO
2
, and Bi
2
S
3
/Ag
2
S/TiO
2
electrodes were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet–visible absorption spectroscopy, and electrochemical analysis. According to photoelectrochemical (PEC) measurement, an enhanced short circuit current density was obtained for the co-sensitized TiO
2
NRAs under simulated sunlight illumination, which was 10.7 times higher than that of the TiO
2
NRAs. Appropriate potential positions of conduction band and valence band of Bi
2
S
3
that match well those of rutile TiO
2
NARs and Ag
2
S lead to the improved PEC performance. In addition, the PEC property of the co-sensitized TiO
2
NRAs under visible light irradiation was also investigated and showed a dramatically enhanced photocurrent response.
Journal Article
Ag sub(2)S/Bi sub(2)S sub(3) co-sensitized TiO sub(2) nanorod arrays prepared on conductive glass as a photoanode for solar cells
TiO sub(2) nanorod arrays (TiO sub(2) NRAs) were synthesized through a hydrothermal method. Ag sub(2)S and Bi sub(2)S sub(3) were then grown on the surface of TiO sub(2) NRAs with successive ionic layer adsorption and reaction method. The pristine rutile TiO sub(2) NRAs, Ag sub(2)S/TiO sub(2), Bi sub(2)S sub(3)/TiO sub(2 ), and Bi sub(2)S sub(3)/Ag sub(2)S/TiO sub(2) electrodes were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet-visible absorption spectroscopy, and electrochemical analysis. According to photoelectrochemical (PEC) measurement, an enhanced short circuit current density was obtained for the co-sensitized TiO sub(2) NRAs under simulated sunlight illumination, which was 10.7 times higher than that of the TiO sub(2) NRAs. Appropriate potential positions of conduction band and valence band of Bi sub(2)S sub(3) that match well those of rutile TiO sub(2) NARs and Ag sub(2)S lead to the improved PEC performance. In addition, the PEC property of the co-sensitized TiO sub(2) NRAs under visible light irradiation was also investigated and showed a dramatically enhanced photocurrent response.
Journal Article
Ag^sub 2^S/Bi^sub 2^S^sub 3^ co-sensitized TiO2 nanorod arrays prepared on conductive glass as a photoanode for solar cells
TiO2 nanorod arrays (TiO2 NRAs) were synthesized through a hydrothermal method. Ag^sub 2^S and Bi^sub 2^S^sub 3^ were then grown on the surface of TiO2 NRAs with successive ionic layer adsorption and reaction method. The pristine rutile TiO2 NRAs, Ag^sub 2^S/TiO2, Bi^sub 2^S^sub 3^/TiO2, and Bi^sub 2^S^sub 3^/Ag^sub 2^S/TiO2 electrodes were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet-visible absorption spectroscopy, and electrochemical analysis. According to photoelectrochemical (PEC) measurement, an enhanced short circuit current density was obtained for the co-sensitized TiO2 NRAs under simulated sunlight illumination, which was 10.7 times higher than that of the TiO2 NRAs. Appropriate potential positions of conduction band and valence band of Bi^sub 2^S^sub 3^ that match well those of rutile TiO2 NARs and Ag^sub 2^S lead to the improved PEC performance. In addition, the PEC property of the co-sensitized TiO2 NRAs under visible light irradiation was also investigated and showed a dramatically enhanced photocurrent response.
Journal Article
Improved structural stability of titanium-doped b-Bi2O3 during visible-light-activated photocatalytic processes
Due to its strong absorption to visible light and intrinsic polarizability, *b-Bi2O3 could be a promising candidate for the visible-light-activated photocatalysis. However, its structural instability during a photocatalytic process prevents it from being used practically. In this work, titanium-doped *b-Bi2O3 was synthesized by a hydrothermal method with subsequent calcination under 400 C. Its crystal structure, photophysical property, and structural stability were investigated by using powder X-ray diffraction, Raman, infrared and diffuse reflectance UV--vis spectroscopies. The crystal structure of the titanium-doped *b-Bi2O3 is analogous to *b-Bi2O3. These two oxides exhibited comparable photocatalytic activities on the photodegradation of indigo carmine, rhodamine B, and methylene blue under visible-light irradiation. However, unlike *b-Bi2O3, the titanium-doped *b-Bi2O3 was quite stable during these photocatalytic reactions. The improvement in structural stability was attributable to the substitution of titanium species in the host crystal lattice. The current investigation results point toward the possibility of metal ion-doped bismuth oxides as efficient visible-light-activated photocatalysts.
Journal Article
Improved structural stability of titanium-doped β-Bi.sub.2O.sub.3 during visible-light-activated photocatalytic processes
Due to its strong absorption to visible light and intrinsic polarizability, β-[Bi.sub.2][O.sub.3] could be a promising candidate for the visible-light-activated photocatalysis. However, its structural instability during a photocatalytic process prevents it from being used practically. In this work, titanium-doped β-[Bi.sub.2][O.sub.3] was synthesized by a hydrothermal method with subsequent calcination under 400 °C. Its crystal structure, photophysical property, and structural stability were investigated by using powder X-ray diffraction, Raman, infrared and diffuse reflectance UV-vis spectroscopies. The crystal structure of the titanium-doped β-[Bi.sub.2][O.sub.3] is analogous to β-[Bi.sub.2][O.sub.3]. These two oxides exhibited comparable photocatalytic activities on the photodegradation of indigo carmine, rhodamine B, and methylene blue under visible-light irradiation. However, unlike β-[Bi.sub.2][O.sub.3], the titanium-doped β-[Bi.sub.2][O.sub.3] was quite stable during these photocatalytic reactions. The improvement in structural stability was attributable to the substitution of titanium species in the host crystal lattice. The current investigation results point toward the possibility of metal ion-doped bismuth oxides as efficient visible-lightactivated photocatalysts.
Journal Article
Fast preparation of ordered crystalline mesoporous titania with high thermal stability and photo oxidation performance
Ordered mesoporous titania with crystalline anatase walls has been synthesized through fast evaporation-induced self-assembly method in a non-aqueous solution that only needs a 30 h synthetic period. The ordered mesostructure and crystalline anatase frameworks are characterized by the low-angle and wide-angle X-ray diffraction (XRD) and transmission electron microscopy (TEM). The ordered titania mesostructure is thermally stable to 733 K, and the corresponding N
2
adsorption–desorption analysis exhibits that it has a surface area of 246 m
2
/g and a narrow pore distribution centered at 3.7 nm. Crystalline mesoporous titania exhibits the higher catalytic performance in photooxiding α-methylstyrene to acetophenone.
Journal Article