PHYSICA SCRIPTA
·
2025
·Vol. 100
·期 3
·035966
·
IF 2.6
Chunxin Wang,Jun Xie,Qi Liu,Yaxuan Liu,Qing Xie
According to the problems of poor insulation and local temperature rise of polypropylene film, a new nano-filler was studied, and the mechanism of improving insulation and thermal conductivity was analyzed. TiO2 with high dielectric constant is combined with Al2O3 with excellent thermal conductivity in the form of a core–shell structure. TiO2 increases the dielectric constant of polypropylene films, and shell Al2O3 introduces high thermal conductivity and assumes the role of dielectric buffer layer. Compared with pure PP, the breakdown voltage of PP/TiO2 is increased by 6.05%, the thermal diffusivty coefficient is increased by 110.67%, the breakdown voltage of PP/TiO2@Al2O3 is increased by 37.05%, and the thermal diffusivity coefficient is increased by 266.85%. Experimental and simulation results show that TiO2 introduces low-density traps, TiO2@Al2O3 introduces high-density deep traps, and Al2O3 modifies the surface defects of high-dielectric nanoparticles and increases the equivalent interface region. Based on the analysis of the experimental results with different mass fractions, this paper proposes the optimal filling ratio of the new core–shell, which provides a new method for the composite dielectric to improve the insulation and thermal conductivity at the same time.
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Materials
·
2024
·Vol. 17
·期 15
·3820
·
IF 3.1
Zhanpeng Xu,Zhineng Lan,Fuxin Chen,Chong Yin,Longze Wang,Zhehan Li,Luyao Yan,Jun Ji
Planar perovskite solar cells (PSCs), as a promising photovoltaic technology, have been extensively studied, with strong expectations for commercialization. Improving the power conversion efficiency (PCE) of PSCs is necessary to accelerate their practical application, in which the electron transport layer (ETL) plays a key part. Herein, a single-anchored ligand of phenylphosphonic acid (PPA) is utilized to regulate the chemical bath deposition of a TiO2ETL, further improving the PCE of planar PSCs. The PPA possesses a steric benzene ring and a phosphoric acid group, which can inhibit the particle aggregation of the TiO2film through steric hindrance, leading to optimized interface (ETL/perovskite) contact. In addition, the incorporated PPA can induce the upshift of the Fermi-level of the TiO2film, which is beneficial for interfacial electron transport. As a consequence, the PSCs with PPA-TiO2achieve a PCE of 24.83%, which is higher than that (24.21%) of PSCs with TiO2. In addition, the unencapsulated PSCs with PPA-TiO2also exhibit enhanced stability when stored in ambient conditions.
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CHEMOSPHERE
·
2024
·
IF 8.1
Liuhan Guo,Hehua Liao,Zhaoliang Wang,Shitong Han,Dongmiao Li,Bing Wang,Jinni Shen,Wenxin Dai,Hailing Xu,Xuxu Wang,Zizhong Zhang
Highly durable photocatalytic degradation of gas toluene pollutants is a great challenge due to the easy deactivation of photocatalysts. Herein, we synthesized the Pt embedded at interface of TiO 2 nanocomposites (TiO 2 /Pt/TiO 2 ) and Pt exposed on the surface of TiO 2 nanocomposites (Pt/TiO 2 /TiO 2 ) to investigate the effect of Pt position on the photocatalytic performance of toluene degradation. It was found that the Pt-exposed samples showed inactivation as the reaction progressed because carbonaceous intermediates such as phenol and benzoic acid were observed to be deposited on the exposed Pt to restrain the role of Pt in electron transfer for the production of reactive oxygen species. Whereas, Pt-embedded nanocomposites had excellent activity and stability for toluene degradation and CO 2 production more than 60 h. This was attributed to the protective effect of the TiO 2 outerlayer. The embedded Pt was not easily poisoned by the degradation intermediates, resulting in a good electron transfer and the continuous production of reactive oxygen species for photocatalytic reaction. Therefore, this work provides an efficient approach for designing of the stability of metal-decorated photocatalyst for the highly durable photocatalytic performance.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Mingshuo Tian,Zhiwei Huang,Jiangwei Ni,Wen Chen,Qiqi Zhou,Huazhen Shen,Xiaomin Wu,Huawang Zhao,Guohua Jing
The elucidation of active sites in Pt-based catalysts for benzene combustion has been a long-standing challenge, hindering the rational design of such catalysts. We have successfully pinpointed the active sites to the perimeters of Pt nanoparticles, deliberately excluding corner atoms. This achievement stems from a comprehensive approach, encompassing controlled synthesis of Pt nanocrystal size and morphology, advanced spectroscopic characterization, and detailed geometrical model analysis. We synthesized well-defined truncated hexahedral Pt nanoparticles with diameters (d) ranging from 2.2 to 6.6 nm. Notably, the turnover frequency (TOF) of our Pt/TiO 2 catalyst correlates inversely with the nanoparticle diameter, following a d -1.09±0.11 trend. This correlation matches the model-predicted perimeter-to-diameter ratio (excluding corners) with a d -1.01±0.09 exponent, confirming the location of the active sites. Further support comes from X-ray photoelectron spectroscopy and experiments using different support materials, which underscore the high activity at the Pt/TiO 2 interface. A crucial H 2 treatment step encapsulating the Pt nanoparticles by TiO x excludes both surface areas and corners as contributing active sites. The 0.7 % Pt/TiO 2 catalyst also demonstrated remarkable stability under testing conditions. In situ FTIR analysis provided insight into the stepwise mechanism of benzene combustion, revealing intermediate species and their transformation pathways. By finely tuning the geometry of Pt nanoparticles and correlating TOF with specific surface sites, our research highlights the perimeters of Pt atoms as the prime active sites for benzene combustion. These results contribute significantly to the field, offering a strategic approach to designing efficient catalysts for VOC elimination, with implications for both environmental protection and the advancement of catalytic science.
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Journal of Environmental Sciences
·
2024
·
IF 5.9
Chunying Li,Yu Zhang,Mengfei Tian,Naveed Ahmad,Kaitao Jia,Zidan Luo,Bin Qiao,Jiabo Cheng,Chunjian Zhao
Porphyrinic hydrogen-bonded organic frameworks (porph-HOFs) have emerged as highly promising materials in the realm of photocatalysis due to their remarkable attributes, including low density, high surface area, efficient visible light absorption, and notable chemical stability. However, the rapid recombination of photogenerated charges remains a significant concern. In this work, a novel HOF-based photocatalyst, PFC-72/TiO 2 was successfully designed with visible light response and high electron transfer capability. This involved bonding TiO 2 nanoparticles to the PFC-72 framework synthesized using cobalt porphyrin as organic ligand and introducing bridging molecules 4-mercaptopyridine (4-PySH). Moreover, sulfadiazine (SDZ), a highly prevalent antibiotic, was effectively degraded from wastewater using PFC-72/TiO 2 . The high specific surface area of PFC-72 significantly improved the dispersion of TiO 2 in PFC-72/TiO 2 , providing more active sites and improving the ability to adsorb SDZ. Characterizations and density functional theory analysis further confirmed that the photosensitization effect of porph-HOF extended the response range of TiO 2 in PFC-72/TiO 2 and reduced the recombination efficiency of photogenerated charges, consequently enhancing photocatalytic performance. Additionally, due to significantly improved robustness of PFC-72 and its axial coordination interaction with 4-PySH, PFC-72/TiO 2 displayed excellent stability and recyclability. Consequently, optimized PFC-72/TiO 2 exhibited a remarkable SDZ removal efficiency of 93.73% within 120 min, maintaining consistent photoactivity even after undergoing four cycles. Furthermore, intermediate products and degradation pathways were proposed based on UPLC-MS/MS.
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JOURNAL OF RAMAN SPECTROSCOPY
·
2025
·
IF 1.9
Qi Zhang,Qingyi Wei,Hongbin Pu
The residues of crystal violet (CV) in shrimp were easily absorbed by biological tissues and caused serious damage to human health. In this study, doped TiO 2 SERS substrates were fabricated with three doping metals including Fe, Cu, and Co by sol-hydrothermal method. The SERS intensities reached the optimum at a Fe 3+ doping ratio of 5% with probe molecules of 4-MBA and CV. The 5% Fe-TiO 2 SERS substrates for monitoring CV residues obtained the best performance with LOD of 0.016 ppm and 0.03 ppm for standard solutions and shrimp protein extract solutions, respectively. The results indicated suitable doping metals could effectively modulate the energy bands of the semiconductor and improve the charge transfer between the substrate and analyte for a stronger SERS signal. The study would enrich the SERS technique for the fast test of CV in the actual samples.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Yunlan Xu,Jiaxin Mou,Lin Dong,Qingmei Qiao,Dengjie Zhong
The performance of photocatalytic fuel cell (PFC) depends on photoanode, which is the key to generate photoexcited carriers and degrade organic wastes. In this study, ZnIn 2 S 4 nano-bandgap semiconductor and polypyrrole were used to modify TiO 2 to prepare polypyrrole/ZnIn 2 S 4 /TiO 2 /Ti photoanode to increase its photo-response range and the separation of photoexcited carriers. The PFC with polypyrrole/ZnIn 2 S 4 /TiO 2 /Ti photoanode and copper cathode was built to degrade RhB and generate electricity. The RhB removal rate, open-circuit voltage, short-circuit current density, and maximum power density of the photocatalytic fuel cell were 94.6 % (1 h), 0.47 V, 0.23 mA cm −2 and 21.11 μW cm −2 , respectively. The improvement of PFC performance is attributed to the good visible-light responsive properties of polypyrrole/ZnIn 2 S 4 .The presence of polypyrrole acts as both an electron donor and a hole acceptor, which provides an ideal pathway for the separation and transmission of photogenerated carriers. The synergistic effect of polypyrrole, ZnIn 2 S 4 and TiO 2 eventually increases the photocatalytic ability of the PFC. This research can offer reference for the study of TiO 2 -based efficient visible light responsive PFC.
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2025
·
IF 2
Xiang Hongliang,Chen Xiaoyu,Huang Ye,Wu Chaochao,Mou Gang,Zheng Kaikui
This study investigated the fabrication of a strengthened Ti-TiO 2 material with adding 0.5 wt.% TiO 2 nanoparticles via selective laser melting process in comparison with CP-Ti. Through the process parameters optimized by response surface methodology, the Ti-TiO 2 material fabricated by SLM showed remarkable tensile strength of 800.6 MPa and elongation of 14%, as compared to the fabricated CP-Ti with tensile strength of 594.0 MPa and elongation of 21%. The x-ray diffraction patterns of fabricated specimens showed the expansion of the hcp -Ti lattice along the c -axis due to dissolved oxygen atoms from the decomposition of TiO 2 nanoparticles. The microstructure analysis observed remains of incompletely decomposed TiO 2 and TiO phases in SLMed Ti-TiO 2 material, which was distinguished from former studies. Consequently, the decomposition behavior of added TiO 2 nanoparticles associated with the dissolved oxygen in the Ti-matrix during the SLM process was discussed. Based on the evaluation of both the solution effect of oxygen atoms and the reinforcing effect of undecomposed nanoparticles, the dissolved oxygen from decomposed TiO 2 was considered the primary factor in the intensified strength of SLMed Ti-TiO 2 material. These results could offer novel insights into the additive manufacturing of high-strength and biocompatible titanium alloy via the SLM process.
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Nanomaterials
·
2025
·Vol. 15
·期 9
·683
·
IF 4.3
Hairui Cai,Benjamin Yang,Jie Hou,Ziqi Wang,Zhuo Li
Formaldehyde, a pervasive indoor air pollutant posing significant health risks, has driven extensive research into advanced mitigation strategies to ensure safer living environments. Herein, this study presents a synthesis method for the large-scale production of hydrogenated TiO2(P25) loaded with PtAu nanoalloys (P25(H)-PtAu), using a combination of ball milling and high-temperature annealing. Hydrogenation-induced defect-rich TiO2efficiently improves visible light absorption, enhancing the utilization of visible light in photocatalytic reactions. Mechanochemical ball milling was employed to prepare ultrasmall PtAu nanoalloys with a size of 3.7 ± 0.1 nm, which were uniformly dispersed on the surface of P25(H). Density functional theory (DFT) results indicate that PtAu nanoalloys synergistically enhance charge separation via Schottky junctions and surface reaction kinetics by optimizing reactant adsorption. As a result, P25(H)-PtAu achieves industrially relevant formaldehyde removal efficiency (97.8%) under ambient light conditions while maintaining scalability (10 g batches). This work provides a scalable framework for developing manufacturable photocatalysts, with immediate applications in heating, ventilation and air conditioning systems, and air purifiers.
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Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-7
·
IF 2.584
Chen Zeng,Wei Chaochao,Li Shengjun,Diao Chunli,Li Wei,Kong Wenping,Zhang Zhenlong,Zhang Weifeng
SnO 2 nanosheet-structured films were prepared on a fluorine-doped tin oxide (FTO) substrate using ZnO nanosheet as template. The as-prepared SnO 2 nanosheets contained plenty of nano-voids and were generally vertical to the substrate. TiO 2 nanoparticles were homogeneously deposited into the intervals between the SnO 2 nanosheets to prepare a hierarchically structured SnO 2 /TiO 2 hybrid film. The hybrid films were co-sensitized with CdS and CdSe quantum dots. The sensitized solar cells assembled with the SnO 2 /TiO 2 hybrid film showed much higher photoelectricity conversion efficiency than the cells assembled with pure TiO 2 films. The lifetime of photoinduced electron was also investigated through electrochemical impedance spectroscopy, which showed that the SnO 2 /TiO 2 hybrid film electrode is as long as the TiO 2 film electrode.
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Nanoscale
·
2025
·
IF 5.1
Mohammadreza Rostami,Biao Yang,Xiaochuan Ma,Sifan You,Jin Zhou,Meng Zhang,Xuefeng Cui,Haiming Zhang,Francesco Allegretti,Bing Wang,Lifeng Chi,Johannes Barth
n-Armchair graphene nanoribbons (nAGNRs) are promising components for next-generation nanoelectronics due to their controllable band gap, which depends on their width and edge structure. Using non-metal surfaces for fabricating nAGNRs gives access to reliable information on their electronic properties. We investigated the influence of light and iron adatoms on the debromination of 4,4”-dibromo-p-terphenyl precursors affording poly(para-phenylene) (PPP as the narrowest GNR) wires through the Ullmann coupling reaction on a rutile TiO2(110) surface, which we studied by scanning tunneling microscopy and X-ray photoemission spectroscopy. The temperature threshold for bromine bond cleavage and desorption is reduced upon exposure to UV light (240-395 nm wavelength), but the reaction yield could not be improved. However, in the presence of codeposited iron adatoms, precursor debromination occurred even at 77 K, allowing for Ullmann coupling and PPP wire formation at 300-400 K, i.e., markedly lower temperatures compared to the conditions without iron adatoms. Furthermore, scanning tunneling spectroscopy data reveal that adsorbed PPP wires feature a band gap of ≈ 3.1 eV.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Jiang Mengpei,Li Jianjun,Wan Xinyi,Qiu Jianhang,Yao Tingting,Zhang Wenyu,Ma Shangyi,Tan Hao,Han Ali,Chen Chunlin,Liu Gang
Plastic photoreforming offers a compelling technology to address the global issue of the large amount cumulative plastic waste by converting it into valuable fuels and chemical feedstocks. However, constrained by insufficient mass and energy transfers, the existing hydrophilic plastic photoreforming systems heavily rely on the unsustainable chemical pre-treatments in corrosive solutions. Herein, we demonstrate a conceptual plastic photoreforming system based on a floatable hydrophobic organic-inorganic hybrid-TiO 2 photocatalyst, which unlocks superoxide radical as the major oxidizing species and forms a four-phase interface among photocatalyst, plastic substrate, water and air, thus greatly enhancing the mass and energy transfers. Consequently, the photoreforming yield rates in neutral aqueous solutions are increased by 1–2 orders of magnitude for typical plastic including polyethylene, polypropylene, and polyvinyl chloride without applying pre-treatments, whilst producing high-value C 2 H 5 OH with a selectivity of over 40%. We believe this work reveals a feasible route to sustainable plastic photoreforming.
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