Frontiers in Chemistry
·
2023
·
IF 5.5
Zhang Chen,Wang Minqiang,Shi Jindou,Wang Junnan,Da Zheyuan,Zhou Yun,Xu Youlong,Gaponenko Nikolai V.,Bhatti Arshad Saleem
The inherent single narrow emission peak and fast anion exchange process of cesium lead halide perovskite CsPbX3 (X = Cl, Br, I) nanocrystals severely limited its application in white light-emitting diodes. Previous studies have shown that composite structures can passivate surface defects of NCs and improve the stability of perovskite materials, but complex post-treatment processes commonly lead to dissolution of NCs. In this study, CsPb(Cl/Br)3 NCs was in-situ grown in TiO2 hollow shells doped with Eu3+ ions by a modified thermal injection method to prepare CsPb(Cl/Br)3/TiO2:Eu3+ composites with direct excitation of white light without additional treatment. Among them, the well-crystalline TiO2 shells acted as both a substrate for the dopant, avoiding the direct doping of Eu3+ into the interior of NCs to affect the crystal structure of the perovskite materials, and also as a protection layer to isolate the contact between PL quenching molecules and NCs, which significantly improves the stability. Further, the WLED prepared using the composites had bright white light emission, luminous efficiency of 87.39 lm/W, and long-time operating stability, which provided new options for the development of perovskite devices.
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Small
·
2023
·Vol. 19
·期 33
·2302443
·
IF 13.3
Jianbo Wu,Xinyuan Zhang,Shihai You,Zeng-Kui Zhu,Tingting Zhu,Ziyang Wang,Ruiqing Li,Qianwen Guan,Lishan Liang,Xinyi Niu,Junhua Luo
Chiral perovskites have been demonstrated as promising candidates for direct circularly polarized light (CPL) detection due to their intrinsic chirality and excellent charge transport ability. However, chiral perovskite-based CPL detectors with both high distinguishability of left- and right-handed optical signals and low detection limit remain unexplored. Here, a heterostructure, (R-MPA) 2 MAPb 2 I 7 /Si (MPA = methylphenethylamine, MA = methylammonium) is constructed, to achieve high-sensitive and low-limit CPL detection. The heterostructures with high crystalline quality and sharp interface exhibit a strong built-in electric field and a suppressed dark current, not only improving the separation and transport of the photogenerated carriers but also laying a foundation for weak CPL signals detection. Consequently, the heterostructure-based CPL detector obtains a high anisotropy factor up to 0.34 with a remarkably low CPL detection limit of 890 nW cm −2 under the self-driven mode. As a pioneering study, this work paves the way for designing high-sensitive CPL detectors that simultaneously have great distinguishing capability and low detection limit of CPL.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yujie Bai,Xibin Yi,Bing Li,Shiwei Chen,Zijie Fan
Polyimide was widely studied as semiconductor polymer photocatalyst. However, polyimide photocatalyst suffers from small specific surface area, poor visible light absorption and low charge thansfer efficiency. Herein, porous polyimide/carbon quantum dots aerogel was prepared successfully via supercritical CO 2 drying method. The carbon quantum dots were obtained by a green hydrothermal method. The carbon quantum dots could be anchored intimately on the polyimide aerogel by π -π stacking interactions. The polyimide/carbon quantum dots aerogel had large specific surface area and porous structure. The carbon quantum dots increased the visible light absorption, adjusted the band structure of the polyimide aerogel and facilitated the generation and separation of photogenerated electron and holes. Thus the photocatalytic property of the polyimide/carbon quantum dots aerogel was increased compared to pure polyimide aerogel. h + and ·O 2 – were the main active species to degrade the pollutant. Finally, the mechanism of the photocatalysis under the visible light was proposed.
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LANGMUIR
·
2021
·
IF 3.882
Liwei Zhao,Ming Gong,Jian Yang,Jinlou Gu
The construction of a biomimetic ionic channel is of great significance for the fabrication of smart biodevices or logic circuit. Inspired by the selective permeability of the cell membrane toward bioions, a light-induced and pH-modulated artificial nanochannel is herein prepared by integrating the multistimuli-response molecule of carboxylated spiropyran (SP-COOH) into the frameworks of NU-1000 (Zr-based MOFs defined by Northwestern University). The loading density of the SP-COOH could reach as high as 7 wt % while keeping unchanged crystallinity and high porosity. Thanks to the precise matching of pore size of NU-1000 and molecular dimensions of SP-COOH, the loaded molecules could proceed free and reversible for isomerization between the hydrophilic and hydrophobic states. The ion-switchable characteristics of the channel are implemented by the amphiphilic change of the light-controlled gate molecule. Additionally, in the hydrophilic state, the channel presents reversible affinity toward cations or anions due to the reverse charge state induced by pH, thus constructing a pH-controlled subgate. Taking [Ru(NH3)6]3+ and [Fe(NH3)]3– as the model cation and anion, their redox peak currents occur as reversible change under different signal combinations of light and pH. Moreover, in accordance with the ionic selective permeability, several logic circuits/devices are designed to display the relationships between exogenous stimuli and ionic transportations in a computer language, prefiguring their wide application prospects in electronic devices and life sciences.
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FUEL
·
2021
·
IF 6.609
Jiaqi Si,Weidong Sun,Guofeng Zhao,Yong Lu
The MnO x -Na 2 WO 4 catalyst for oxidative coupling of methane (OCM) is highly attractive but its high light-off temperature (>800 °C) is a major obstacle for commercialization. In-depth understanding of reaction light-off relevant chemistry is particularly desirable. We explored the OCM light-off over several metal-oxide-supported MnO x -Na 2 WO 4 catalysts. As CH 4 conversion above 15% with acceptable C 2-3 selectivity is considered as the sign of OCM light-off, support-dependent OCM light-off is clearly observed over MnO x -Na 2 WO 4 supported on SnO 2 (660 °C), TiO 2 (670 °C), MgO (690 °C), and ZnO (720 °C), being tightly linked with the redox rate of Mn 3+ (or Mn 4+ ) ↔ Mn 2+ cycle governed by support oxides.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Xuesong Zhao,Yingying You,Yiyang Ma,Chenchen Meng,Zhenghua Zhang
Toxic organic dyes are a serious threat to the global environment, and membranes with catalytic properties show great promise as a green water treatment method for removing these pollutants. Herein, Ti 3 C 2 /W 18 O 49 photocatalytic membranes were constructed by vacuum filtrating Ti 3 C 2 and W 18 O 49 to form a hybrid layer on a mixed cellulose ester (MCE) support. The efficient separation of dyes was attributed to the negative charge and abundant –OH groups of Ti 3 C 2 /W 18 O 49 , which can capture cationic dyes by electrostatic adsorption and form hydrogen bonds with the amino groups of dye molecules. Moreover, the Ti 3 C 2 /W 18 O 49 membrane exhibited excellent photocatalytic performance and a dye-contaminated membrane was regenerated under visible light in 120 min. The two component materials complement each other, with the W 18 O 49 providing adsorption sites and photocatalytic ability and the Ti 3 C 2 serving as an electron trap and improving charge separation. Photoinduced electrons in the conduction band of W 18 O 49 are transferred to Ti 3 C 2 to form O 2 – , while holes remain in the valence band of W 18 O 49 to generate OH, and h + . O 2 – and OH are mainly responsible for the degradation of dyes. Therefore, this efficient and easily prepared membrane shows practical potential as a next-generation method for dye removal from water.
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Alexandria Engineering Journal
·
2021
·
IF 3.732
Yaya Wang,Yuqi Gu,Shun Yang
The reuse of support material still hamper the practical application of enzyme immobilization technology in wastewater treatment. Here, a novel strategy based on light-triggered reversible β-cyclodextrin (β-CD)-Azobenzene(Azo) host-guest interaction was developed. First, magnetic Fe 3 O 4 nanoparticles were coated with porous β-CD-containing polymers(PCDP), and then the Azo-modified enzyme was immobilized in normal condition. The immobilization would enhance the stability and catalytic performance of enzymes, and the easy separation from reaction medium could be available with external magnetic field. Over broad ranges of temperature and pH, the immobilized enzyme showed higher activity than free enzyme, and the phenol removal efficiency retained about 58.63% even after five cycles. Under UV light, the photoisomerization of Azo would lead to disassemble of β-CD-Azo interaction, resulting in the detachment of the enzyme, and phenol removal efficiency decreased to only 16%. The support materials could be recovered for continue enzyme immobilization, results based on cyclic process of enzyme immobilization and detachment strongly demonstrated the detachment of enzyme and excellent reusability of Fe 3 O 4 @PCDP. And this strategy was proved to be a practical method based on batch experiments on the removal of phenol by tyrosinase (Tyr)-based remediation.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Yongsheng Yang,Changxing Wang,Siyuan Tang,Da Chen,Xiameng Li,Zhao Peng,Chenjie Gu
Recently, graphene quantum dots (GQDs) with polychrome emission capability have attracted much attention due to their multifarious applications. In this study, we report a facile and green approach for rapid preparation of multicolor emission GQDs. Experimentally, UV light was used to drive the low-temperature synthesis, and a tunable emission wavelength of the GQDs was achieved through the synergistic effect of solvatochromic tuning and sulfur doping. Results show that multicolor emission wavelengths of green-GQDs (G-GQDs) from blue to yellow are obtained by simply controlling the polarity of the surrounding solutions. Moreover, red-GQDs with the emission wavelengths extended from green to red are further obtained by sulfur doping. Thereafter, G-GQDs were used to develop a trace water-detecting platform, ascribed to the high sensitivity of water-quenchable fluorescence, and a low detection limit of 0.061% was achieved. Meanwhile, based on the outstanding multicolor tunability of as-prepared GQDs, we successfully manufactured multicolor solid fluorescence films to fabricate multicolor light-emitting diode (LED) devices. Furthermore, high-quality white LEDs (WLEDs) are fabricated with the CIE coordinates of (0.341, 0.354) and a color temperature of 5161 K. This study highlights the potential of GQDs in various applications, including solid-state fluorescence films, optoelectronics, and optical molecular sensing.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 45
·16711-16719
·
IF 4.39
Ying Jiang,Cunxin Mei,Zhijie Zhang,Zhongliang Dong
Perovskite CsPbBr3 nanocrystals (NCs) have emerged as promising candidates for the photocatalytic reduction of CO2. However, the CO2 conversion efficiency of pristine CsPbBr3 is still unsatisfactory, mainly due to severe radiative recombination, poor stability and low CO2 capturing ability. Coincidentally, nanoporous carbon powder (NCP) has received tremendous attention for environmental remediation and renewable energy production. Herein, by immobilizing CsPbBr3 NCs into the pores of NCP, a CsPbBr3/NCP hybrid has been successfully constructed for the first time, which combined the advantages of CsPbBr3 NCs and NCP. In comparison with pristine CsPbBr3, the resultant hybrid photocatalyst exhibited much superior photocatalytic performance in CO2 reduction, which could be attributed to the enhanced electron extraction and transfer between CsPbBr3 NCs and NCP, higher CO2 capturing ability and more active sites for CO2 activation. Furthermore, the nanohybrid displayed remarkable reusability in photocatalytic CO2 reduction. This study is anticipated to provide a new pathway for the design and fabrication of high-performance photocatalysts based on perovskites for solar-energy-conversion applications.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 44
·15942-15948
·
IF 7.393
Chenkai Deng,Shiqiang Hao,Kunjie Liu,Maxim S. Molokeev,Christopher Wolverton,Liubing Fan,Guojun Zhou,Da Chen,Jing Zhao,Quanlin Liu
Low-dimensional organic–inorganic metal halides have recently attracted extensive attention because of their various structures and distinguished photoelectric properties. Herein, we report a series of new zero-dimensional organic–inorganic hybrid metal halides: (TMEDA)3Bi2Cl12·H2O, (TMEDA)3Bi2Br12·H2O, (TMEDA)3Sb2Br12·H2O, and (TMEDA)5Sb6Cl28·2H2O [TMEDA = N,N,N′·trimethylethylenediamine]. (TMEDA)3M2X12·H2O (M = Bi or Sb, X = Cl or Br) crystallizes in the monoclinic space group P21/n, and (TMEDA)5Sb6Cl28·2H2O crystallizes in the orthorhombic space group Pnma. (TMEDA)3M2X12 possesses a zero-dimensional structure with the metal halide ions of [MBr6]3− isolated by the organic TMEDA2+ cations. Interestingly, the (TMEDA)5Sb6Cl28·2H2O structure consists of a combination of corner-connected octahedra [Sb4Cl18]6− and edge-shared [Sb2Cl10]4−, which is quite rare. The light emission of all these compounds was measured, and (TMEDA)3Sb2Br12·H2O exhibits the most intense luminescence. Upon 400 nm ultraviolet light excitation, (TMEDA)3Sb2Br12·H2O exhibited strong broadband yellow emission centered at 625 nm with a full-width at half-maximum of ∼150 nm originating from self-trapped excitons. This work suggests the possibility of new types of hybrid halides by introducing different metal centers and probing the structural evolution and photoluminescent properties, serving as a reference for the relationship between structure and luminescent performance and demonstrating their potential use as phosphors in light-emitting diodes.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhongming Wang,Xiong Shen,Jinhe Wei,Lin Chen,Fei Hu,Fanfan Qi,Qiuyun Ouyang
Carbon quantum dots (CQDs) were prepared by a thermal cracking method; amino-modified CQDs (NH2-CQDs) were synthesized by a hydrothermal method, and zinc-reduced CQDs (Zn-CQDs) were synthesized by a mild method. Optical properties and stability are two key issues for further applications of CQDs. In this study, we report a simple and effective method to simultaneously improve the optical properties and stability of CQDs. We generated Zn-CQDs by reacting zinc powder with CQD solution, which was operated under mild conditions and completed in a short time. These three materials were placed in an air environment for 48 h. The results show significantly improved moisture resistance of Zn-CQDs compared to the other two materials. The exciton binding energy of Zn-CQDs was calculated by the temperature-dependent fluorescence emission spectra to be 208.7 meV, which is much higher than those of 49.9 meV for CQDs and 46.6 meV for (NH2)-CQDs. This indicates that Zn-CQDs exhibit more stable internal exciton states, a higher degree of crystal ordering, and better moisture resistance. Due to the good moisture resistance and excellent photoluminescence properties of Zn-CQDs, their solid powders were used as color conversion materials for making fluorescence-excited LED devices. Finally, a blue light-emitting LED with a stable and bright color was obtained.
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MOLECULES
·
2023
·Vol. 29
·期 1
·144
·
IF 4.6
Tao Tian,Jie Zhang,Lijiang Tian,Sijie Ge,Zhenyu Zhai
Visible-light-enhanced TiO2nanocatalysts doped with Cu and Fe were synthesized using the sol–gel method to investigate their performance in degrading gaseous benzene. The structure and morphology of mono- and co-doped TiO2(i.e., Cu/Fe-TiO2, Cu-Fe-TiO2) were characterized using SEM, EDS, XRD, BET, Raman, UV-vis-DRS, and XPS techniques. The results indicated that the presence of Cu/Fe mono- and co-doped TiO2leads to the formation of an anatase phase similar to pure TiO2. Furthermore, the introduction of Cu/Fe enhanced the presence of lattice defects and increased the specific surface area of TiO2. This enhancement can be attributed to the increase in oxygen vacancies, especially in the case of Cu-Fe-TiO2. Additionally, Cu-Fe-TiO2showed a higher concentration of surface-bound hydroxyl groups/chemically adsorbed oxygen and a narrower bandgap than pure TiO2. Consequently, Cu-Fe-TiO2exhibited the highest photocatalytic performance of 658.33 μgC6H6/(g·h), achieving a benzene degradation rate of 88.87%, surpassing that of pure TiO2(5.09%), Cu-TiO2(66.92%), and Fe-TiO2(59.99%). Reusability tests demonstrated that Cu-Fe-TiO2maintained a high benzene degradation efficiency of 71.4%, even after five experimental cycles, highlighting its exceptional stability and reusability. In summary, the addition of Cu/Fe to TiO2enhances its ability to degrade gaseous benzene by prolonging the catalyst’s lifespan and expanding its photoresponse range to include visible light.
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