DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 28
·9804-9811
·
IF 4.39
Zexin Li,Fenglei Sun,Haining Song,Haifeng Zhou,Yifei zhou,Zhenlei Yuan,Peng Guo,Guangjun Zhou,Qianqian Zhuang,Xiaoqiang Yu
Lead-free double perovskite has attracted widespread attention due to its good stability and non-toxicity. In this work, Cs2AgxNa1−xInCl6 quantum dots were synthesized via a thermal injection method using non-toxic precursors. Based on the wide spectrum of self-bound excitons, the quantum dots achieved white light emission. Bi-doped Cs2AgxNa1−xInCl6 quantum dots with excellent luminescence performance have the same cubic structure, and they have a larger Stokes shift. The cubic perovskite space group is Fmm, and [NaCl6], [AgCl6] and [InCl6] octahedrons alternately appear in the cubic structure. The photoluminescence quantum yield of Cs2AgxNa1−xInCl6 is improved by doping with a small amount of Bi; the PL QY increased to 57.3% with an obvious emission peak at 600 nm. The stability and luminescence intensity of perovskite QDs were further enhanced by SiO2 coating and a Cs2AgxNa1−xInCl6:Bi-SiO2 thin film was prepared using perhydropolysilazane as the precursor. The materials have huge application potential in the field of white light emission and display.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2016
·
IF 2.693
Yanping Miao,Ping Yang,Katarzyna Matras-Postolek
Large flexible silica films encapsulating hydrophilic CdTe quantum dots (QDs) were fabricated via controlling the hydrolysis of 3-aminopropyltrimethoxysilane (APS). Hydrophilic CdTe quantum dots with green to red emitting were encapsulated in the films through a sol–gel incorporation process for retaining high photoluminescence (PL) efficiency and stability. Fluorescence microscopy and a scanning electron microscopy were employed to examine dispersion of CdTe QDs in the emitting films, which illustrated that structure of silica films was uniform. The PL stability of these flexible silica films was investigated in argon condition, the PL properties of the films encapsulated green-, yellow-, and red-emitting CdTe QDs were very stable. Furthermore, the silica-CdTe QDs emitting films revealed high PL stability under ultraviolet (UV) light irradiation , proper concentration of QDs in silica films can make the films more stable. In addition, different emission flexible silica-CdTe QDs films with large area were obtained. The dual-emitting silica-CdTe QDs films exhibited coordinates (0.384, 0.350) in the Commission Internationale de I׳Eclairage (CIE) chromaticity diagram under blue light as excitation source. Due to flexibility, adjustable colors, high stability, large area, easy to operate, silica-CdTe QDs emitting films show potential application in lighting devices and flat panel displays .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 104
·59733-59739
·
IF 3.708
Yingying Du,Ping Yang,Hsueh-Shih Chen,Quande Che,Yunshi Liu,Haiyan He,Yanping Miao,Jie Zhao
Highly luminescent hydrophobic CdSe and CdSe/CdxZn1−xS quantum dots (QDs) were synthesized via an organic route. The phase transfer of the QDs was carried out through a ligand exchange from 3-aminopropyltrimethoxysilane (APS) instead of an organic capping agent to get aqueous QDs. A functional sol–gel SiO2 sol with a high QD concentration was obtained from the aqueous QD colloidal solution with APS through the hydrolysis and condensation which subsequently occurred. Flexible inorganic SiO2 films with QDs were fabricated via various methods. The photodegradation experiments of the resulting films were completed. It is surprising that the QDs in films were revealed to be highly stable. Especially, the PL intensity of the films increased dramatically after irradiation by 365 nm UV light. By integrating a thin CdSe QD–silica film on a solar cell, the enhanced current demonstrated that a thin film can facilitate the continuous development of solar cells. Because of their high PL brightness, multicolor emission, flexibility and stability, these films will have great potential applications.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Wenjun Tu,Weiquan Cai,Yihong Jiang,Fanxin Kong,Jiabin Zhou
The rare-earth elements (La, Ce, and Y)-modified SiO2 films for effective Cr(VI) removal from electroplating effluent were synthesized by a convenient sol–gel method successfully. X-ray diffraction, Fourier transform infrared spectra (FT-IR), scanning electron microscope, energy-dispersive system, and X-ray photoelectron spectroscopy (XPS) were applied to characterize their physicochemical properties. The adsorption isotherms showed that the adsorption capacity of SiO2 modified by La3+ (64.43 mg g–1) is the best, followed by Ce3+ (53.45 mg g–1) and Y3+ (47.83 mg g–1) because of the different ion-exchange capacities of La/Ce/Y–(OH), whereas that of SiO2 film without modification is only 38.54 mg g–1. Their adsorption processes could be well depicted by the pseudo-second-order kinetic model. The thermodynamics study showed that the adsorption process of the La/SiO2 film is spontaneous. The adsorption mechanism includes the ion exchange and electrostatic effect. Furthermore, the conversion of Cr(VI) to Cr(III) during the in situ reduction process was verified by both macro (optical photographs) and micro (FT-IR and XPS) levels. Importantly, the La/SiO2 film showed high adsorption selectivity and high removal efficiency of 97.4% toward Cr(VI) from initial concentration of 41.7 mg L–1 to residual concentration of 1.1 mg L–1 in the real electroplating effluent, indicating its potential industrial value for pretreatment of heavy metal wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 85
·期 3
·703-711
·
IF 1.745
Zhang Guoping,Zhang Jiawei,Niu Fangfang,Zhang Fan,Zhao Songfang,Wang Mingliang,Gao Yongju,Sun Rong,Wong Chingping
In this work, a novel bridged organosilane precursor, adamantane-bridged organosilane (ADBO), was synthesized successfully which was employed to prepare adamantane-based (ADH-based) periodic mesoporous organosilica (PMO) thin film in the presence of porogen and acid catalyst via evaporation-induced self-assembly (EISA) after spin-coating procedure. The resultant ADH-based PMO thin films were characterized by FTIR, NMR, TEM, and small-angle XRD. The ADH-based PMO thin film with weight ratio of porogen to ADBO (0.75:1) possesses low dielectric constant (1.55 ± 0.04@1 MHz), excellent Young’s modulus (6.69 ± 0.54 GPa), and ideal hydrophobic property (90.2° of water contact angle) simultaneously. These outstanding properties of ADH-based PMO film can be ascribed to lower polarity, lower density, and rigid cavity structure of adamantane, which suggests its potential application as high-performance low- κ material in next-generation microelectronics.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
M. Lu,Q. Liu,Z. Wang,X. Zhang,G. Luo,J. Lu,D. Zeng,X. Zhao,S. Tian
An antireflection (AR) film on the surface of the photovoltaic glass can significantly improve the photoelectric conversion efficiency of solar cells. However, AR films prepared by a facile and low-cost sol-gel method usually exhibit poor mechanical properties , which limits their applications. Herein, hexamethoxy methyl melamine resin (CYMEL 303LF) was employed as a pore-forming agent in the sol and sacrificial template to prepare porous SiO 2 film on glass by a facile sol-gel method and subsequent heat treatment. The obtained SiO 2 film showed a high solar transmittance increase of 3.24% in the wavelength range of 380–1100 nm and a good hardness of H when the dosage of CYMEL 303LF is 10 wt%, the short circuit current density and photoelectric conversion efficiency of the solar cell are increased respectively by 1.44 mA/cm 2 and 1.08%, compared with the substrate, which is better than most SiO 2 films in the previous works. With increasing the dosage of CYMEL 303LF from 0% to 12%, the solar transmittance gain was increased at first and then decreased, while the film hardness was decreased straightly. This was probably because that the introduction of CYMEL 303LF can facilitate the formation of more pores in the SiO 2 film, leading to a decrease in the refractive index and film adhesion. Therefore, this work can provide a facile method to prepare high-performance SiO 2 as AR film for solar cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 17
·7966-7976
·
IF 2.302
Zhang Jiawei,Zhang Guoping,Gao Yongju,Sun Rong,Wong C. P.
A novel bridged organosilane precursor with star-shaped construction, [hexfluoropropane-2,2-diyl)dibenzyl-bridged organosilane (HFPDBO)], is prepared by facile organic synthesis method. The resultant HFPDBO precursor is mixed with porogen and acid catalyst to prepare periodic mesoporous organosilica (PMO) thin film via evaporation-induced self-assembly after spin-coating procedure. All the as-prepared HFPDB-based PMO thin film has been characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectrum, scanning electron microscopy,
transmission electron microscope, and small-angle X-ray diffraction, respectively. Thereinto, the HFPDB-based PMO thin film with weight ratio of porogen to precursor (0.75:1) possesses excellent dielectric property (1.58@1 MHz of dielectric constants), high mechanical property (5.54 ± 0.11 GPa of Young’s modulus) and hydrophobic property (90.1° of water contact angle) simultaneously. These low dielectric constant, high mechanical strength, and the hydrophobicity suggest potential application of the HFPDB-based PMO thin films as low-k materials in microelectronics.
研究领域:
材料科学
·
微电子学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Sijun Li,Donghui Kou,Aini Wu,Lei Gao,Shufen Zhang,Wei Ma
Fogging on transparent substrate greatly impacts transmittance, causing inconvenience and potential hazards. Increasing surface roughness to enhance hydrophilicity often reduces transmittance. Here, by enhancing the Marangoni flow to inhibit the coffee-ring effect during SiO 2 droplet drying, we propose for the first time to manufacture superhydrophilic and high-transmittance coatings with porous structures on various substrates, including glass and resin. This approach relies on a simple, potentially large-scale ultrasonic spray method to enhance the Marangoni flow of SiO 2 dispersion with different particle sizes by adding multiple surfactants to reduce the surface tension of the dispersion. The water contact angle of the SiO 2 film decreases to below 5° within 0.5 s, imparting anti-fogging properties to the substrate. The film exhibits a transmittance of 93.1% at 580 nm, surpassing the inherent 90.8% transmittance of the bare glass. Notably, the film shows remarkable self-cleaning properties due to potent hydration from eco-friendly SiO 2 nanoparticles and the porous structure. Owing to the hydrogen bonding between tightly packed small-sized SiO 2 particles as well as between the particles and substrate, the surface morphology of the film on glass remains intact even after washing, and soaking. The porous SiO 2 film, with a contact angle dropping to below 5° within 0.5 s, maintains its superhydrophilicity even after being exposed to high temperatures, UV irradiation, and humidity conditions. The simple production process of the porous SiO 2 films offers a promising method for preparing high-transmittance anti-fogging films with significant industrial potential.
研究领域:
材料科学
·
表面工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2016
·
IF 5.154
Yan-Hua Liu,Xiao-Han Jin,Ji-Ming Hu
This work presents a new type of coating system based on the use of electrodeposited SiO 2 (E-SiO 2 ) film post-treated with (3-glycidoxypropyl)-trimethoxysilane (GPTMS) as the pretreatment layer. The silane-modified E-SiO 2 films take advantage of not only the highly rough and porous features provided by E-SiO 2 skeleton, but also the chemical functionalization offered by organosilane molecule. As a result, the composite pretreatment layer provides improved adhesion to the topcoat. In addition, the experimental results of electrochemical impedance spectroscopy, salt spray test, iron-dissolution measurement and the scanning vibrating electrode technique suggest that painting system constructed on GPTMS-treated E-SiO 2 films exhibits excellent corrosion performance.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Polish Journal of Chemical Technology
·
2024
·Vol. 26
·期 2
·25-30
·
IF 0.7
Lili Wan,Jie Yang,Xiaoru Liu,Jiayi Zhu,Gang Xu,Chenchun Hao,Xuecheng Chen,Zhengwei Xiong
A facile sol-gel procedure was employed to create refractive-index gradient SiO2 antireflective (AR) films. A monolayer film, characterized by the porous crosslinking framework, was fabricated with a designed volume ratio mixture both with colloidal silica suspension and soluble organic polysiloxane. The upper layer for the bilayer film was a hexamethylisilazane (HMDS) modified colloidal silica suspension, leading to the film surface transfer to hydrophobic. The strategic design of nanostructures in the bottom and upper layers resulted in a refractive-index gradient SiO2 film with enhanced AR properties. The bilayer film demonstrated a transmittance of 99.5% at 1064 nm, accompanied by a notable reduction in reflectivity. Moreover, the laser-induced damage threshold of the bilayer film was increased by 30%, rising to as high as 24.7 J/cm2. The SiO2 nanostructured film both showed a refractive-index gradient structure with excellent AR properties and exhibited good laser damage resistance.
研究领域:
光学材料
·
薄膜技术
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-8
·
IF 6.232
Yan Fei,Ma Xinyu,Jin Qifan,Tong Yun,Tang Hongliang,Lin Xingyu,Liu Jiyang
The selective electrochemical determination of fluoride is reported by phenylboronic acid-functionalized vertically ordered mesoporous silica film attached to the indium tin oxide electrode, designed as PBA-VMSF/ITO. Fluoride ion can selectively bind to phenylboronic acid to generate boronate anions, leading to negative charges inside the ultrasmall nanochannel of VMSF and ultimately rejecting the access of potassium ferricyanide ions to the electrode surface. By recording the reduced electrochemical signal of potassium ferricyanide, determination of fluoride ion in aqueous solution was achieved with a fast response, wide response range, and high selectivity. Furthermore, with the specific recognition of PBA and anti-fouling ability of VMSF, the PBA-VMSF/ITO sensor has been successfully used to detect fluoride ion in tap water.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Xue-Fen Zhang,Yi-Qing Chen,Ji-Ming Hu
One of the biggest obstacles for superhydrophobic films in applications is their poor mechanical resistance. In this research, robust superhydrophobic SiO 2 films were constructed on mild steel (MS) for corrosion protection by the combination of rough electrodeposited SiO 2 (E-SiO 2 ) films and durable polydimethylsiloxane (PDMS) polymer with low surface energy. Results show that the PDMS content has a great effect on the microtopography, wettability , roughness, and wear-resistance of the final films. EIS measurements indicate that as-prepared robust superhydrophobic E-SiO 2 /PDMS films exhibit good corrosion inhibition efficiency of up to 99.99 % for MS substrates in 3.5 wt.% NaCl solution.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）