ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Si-Qi Xiao,Liu-Zong Liu,Zhen-Long Zhang,Yue-Feng Liu,Hui-Ping Gao,Hua-Fang Zhang,Yan-Li Mao
Poor stability retards the industrialization of perovskite solar cells (PSCs). One of the effective ways to solve this issue is to modify the perovskite surface to improve the efficiency and stability of the PSCs. Herein, we synthesized CuFeS2 nanocrystals and applied them to modify the perovskite surface. The efficiency of the PSCs with CuFeS2 modification is improved to 20.17% from 18.64% for the control devices. Some investigations demonstrate that the CuFeS2 modification passivates the perovskite surface defects and induces better energy band arrangement. Furthermore, the stability of the PSCs with CuFeS2 modification is improved compared with the devices without CuFeS2 modification. The efficiency of the PSCs with CuFeS2 modification maintains 93% of its initial value, whereas that of the devices without CuFeS2 modification decreases to 61% of the initial value. This work demonstrates that CuFeS2 is a novel material used as a modification layer to enhance the efficiency and stability of the PSCs.
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ACS Photonics
·
2023
·
IF 7
Haoqiang Huang,Changrui Liao,Mengqiang Zou,Dejun Liu,Shen Liu,Ying Wang,Zhiyong Bai,Dan Liu,Bozhe Li,Jiabin Huang,Famei Wang,Jie Zhou,Cong Zhao,Xiaoyu Weng,Liwei Liu,Junle Qu,Yiping Wang
“Lab on Fiber” technology integrates different micro- and nanoscale structures or materials onto optical fibers to create additional functionality. With the advanced femtosecond (Fs) laser-induced two-photon polymerization (TPP) technology, polymer microstructures printed on a fiber tip have great potential as micro-optical sensors. However, additional functionalization is usually required, which is costly and complex. Based on the advanced four-dimensional (4D) printing theory, for the first time, a successive multimaterial on-fiber TPP strategy is proposed here, and a fiber-tip polymer microcantilever-based magnetic sensor is prepared in one step. First, the cantilever and the supporting base on the fiber tip are printed by TPP, and then the magnetically responsive cube on the cantilever tip is printed with a self-made magnetic fluid photoresist. The whole process is completed in one step without additional treatment. The prepared sensor shows a minuscule size and a high magnetic sensitivity of 119 pm mT–1 in the range of 0–90 mT, suitable for weak or microspace magnetic field measurement at high spatial resolution. Especially, the proposed 4D successive on-fiber TPP strategy can be extended to other stimulus-responsive materials, providing new guidance for manufacturing various stimulus-responsive microsensors and microactuators on the fiber tip.
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Nano Research
·
2023
·Vol. 16
·期 7
·10476-10482
·
IF 9.9
Li Xiaohan,Liu Aijun,Wang Zhaoyu,Wei Youchao,Lin Qun,Chen Yameng,Liu Yongsheng,Hong Maochun
Self-trapped excitons (STEs) emission from halide perovskites with strong exciton-phonon coupling has attracted considerable attention due to the widespread application in optoelectronic devices. Nevertheless, the in-depth understanding of the relationship between exciton-phonon coupling and luminescence intensity remains incomplete. Herein, a doping-enhanced exciton-phonon coupling effect is observed in Cs 3 Cu 2 I 5 nanocrystals (NCs), which leads to a remarkable increasement of their STEs emission efficiency. Mechanism study shows that the hetero-valent substitution of Cu + with alkaline-earth metal ions (AE 2+ ) causes a greater degree of Jahn–Teller distortion between the ground state and excited state structures of [Cu 2 I 5 ] 3− clusters as evidenced by our spectral analysis and first-principles calculations. As a consequence, an X-ray detector based on these Cs 3 Cu 2 I 5 :AE NCs delivers an X-ray imaging resolution of up to 10 lp·mm −1 and a low detection limit of 0.37 µGy air ·s −1 , disclosing the potential of doping-enhanced exciton-phonon coupling effect in improving STEs-emission and practical application for X-ray imaging.
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CRYSTENGCOMM
·
2023
·Vol. 25
·期 25
·3655-3661
·
IF 3.1
Ningkang Qian,Degong Ding,Liang Ji,Junjie Li,Hui Zhang,Deren Yang
Lattice engineering is a powerful strategy not only to optimize electrocatalytic performances, but also to deepen the understanding of electrocatalytic mechanisms. Lattice engineering can be effectively achieved in core–shell nanocrystals owing to the lattice mismatch of heterostructures. Herein, we constructed three kinds of icosahedra consisting of Au73Pd27@Pt, Au66Pd34@Pt and Pd@Pt core–(interlayer)–shell by a seed-mediated method. The introduction of an ultrathin Pd interlayer in the Au66Pd34@Pt icosahedra enables us to separately identify the strain effect and ligand effect. The specific activities towards the EOR of these icosahedra are in the sequence Au73Pd27@Pt > Au66Pd34@Pt > Pd@Pt, indicating that both the ligand effect and strain effect caused by Au can enhance the activity of Pt towards the EOR. The in situ FTIR studies confirm that the EOR processes on these icosahedra are all dominated by the C2 pathway, and hence we ascribe the enhancements of EOR activities to the faster kinetics of the C2 pathway by producing acetate or acetaldehyde.
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ChemistrySelect
·
2023
·Vol. 8
·期 20
·e202300434
·
IF 2.1
Lixin Zhang,Chumin Yan,Xiaoli Dong,Yu Wang,Nan Zheng,Hongchao Ma,Xiufang Zhang
Graphical In this work, the photocatalytic activity of TiO 2 with narrow band gap was successfully improved by a simple solvothermal method. Under visible-light illumination, TiO 2 sample after solvothermal treatment at 180 °C for 24 h (defined as TiO 2 -180-24) can be excited to produce photogenerated electrons and holes. Part of the electrons from the CB move to the catalyst surface and react with dissolved O 2 in solution to form ⋅O 2 − for the degradation of tetracycline (TC). Meanwhile, part of the holes from VB can also move to the catalyst surface and be directly used for the degradation of TC. In addition, the VB potential of TiO 2 -180-24 (E VB =0.56 V vs. NHE) is less positive than the oxidation potential of ⋅OH/OH − (2.38 V vs. NHE), indicating that photogenerated holes cannot oxidize OH − to generate ⋅OH. However, the results of radical capture experiments and ESR measurements indicated the presence of ⋅OH during photocatalytic degradation. Therefore, the further reduction of ⋅O 2 − can be considered as the source of ⋅OH in the photocatalytic degradation process. The generated ⋅O 2 − and ⋅OH together with h + as strong oxidants can react with TC, and finally oxidize TC into small molecular compounds such as CO 2 and H 2 O. Photocatalytic degradation of organic pollutants driven by visible-light is considered as a promising and effective water purification strategy. In this work, solvothermal treatment was carried out on visible-light-responsive TiO 2 samples in isopropyl alcohol to improve the photocatalytic degradation performance. The effects of solvothermal treatment on the microstructure, band structure, optical properties, photoelectrochemical properties and photocatalytic activity of the obtained TiO 2 samples were systematically investigated. The experimental results showed that the photocatalytic degradation performance of the treated TiO 2 samples was significantly improved. The TiO 2 sample treated for 24 h at 180 °C showed the optimal kinetic constant of photocatalytic degradation of tetracycline, which is 4.7 times that of pristine TiO 2 . This work provides some insight into the effect of solvothermal treatment on the photocatalytic properties of semiconductor photocatalysts.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Jiexuan Jiang,Ronghua Li,Dongliang Liu,Hongtao Xie,Qiugui Zeng,Yanbo Li
The all-inorganic CsPbI2Br perovskite possesses outstanding thermal stability as a light absorber in perovskite solar cells (PSCs) or photodetectors. Still, their sensitivity to moisture induces irreversible decomposition and a large number of halogen vacancy defects, hindering their commercial applications. Herein, by incorporating 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) ionic liquids (ILs) as a precursor additive, a CsPbI2Br light absorber with an improved carrier lifetime and reduced trap density is achieved. Moreover, the modification of the perovskite surface with CsPbBr3 quantum dots (QDs) further improved the efficiency and moisture stability of the PSC. As a result, the BMIMBF4 IL and CsPbBr3 QD co-modified PSC achieves a maximum power conversion efficiency (PCE) of 15.37% and retained 80% of its initial PCE after exposure to ambient air for 60 h. This work proposes a synergistic approach for developing high-performance organic-free PSCs with an improved PCE and moisture stability.
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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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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Rongkun Zhu,Zengcheng Du,Mingfang Zhu,Huanru Liang,Shumei Wang,Qing Zhou,Rui Li,Yulan Li,Chaoying Zeng,Wenhao Liu,Qiqing Chen
A ratiometric fluorescence sensor based on molecularly imprinted polymers embedded with double perovskite quantum dots (green fluorescent CsPbBr 3 (GPQDs) and red fluorescent CsPbI 3 (RPQDs)) were prepared for the visible and fluorescent determination of Rhein. Double perovskite quantum dots were synthesized by a one-pot method with in-situ hydrolysis, and the fluorescent probes containing GPQDs and RPQDs with molecularly imprinted cavities (MIPs@RPQDs/GPQDs@SiO 2 ) were synthesized by sol gel method. And the synthesized MIPs@RPQDs/GPQDs@SiO 2 can emit two stable and independent fluorescence peaks at 520 nm with green fluorescence and at 695 nm with red fluorescence respectively. Since Rhein could specifically quench the red fluorescence without affecting the green fluorescence at 520 nm, a ratiomitric fluorescence sensor could be and was constructed with GPQDs as the internal standard signal and the RPQDs as the response signal. The sensor had a good linear relationship with the concentration of Rhein between 15 and 135 nM, and the detection limit was 1.90 nM (S/N = 3). Moreover, Rhein could be detected by observing the color transformation of the fluorescent probe directly with naked eyes. In addition, Rhein in the traditional Chinese medicine Rheum palmatum L. had been detected by the constructed ratiometric fluorescene probe with satisfactory.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Liangyuan Qi,Wei Cai,Weijie Zhang,Bangyu Wang,Wensheng Li,Xiaohui Jin,Liang Chen,Bin Yu,Yuan Hu,Weiyi Xing
Despite the wide applications in clothing, furniture, and transportation, the well-known “scaffolding effect” in polyester-cotton fabric has caused significant fire hazards compared to sole polyester or cotton fabrics. Therefore, it is of practical significance to endow polyester-cotton fabric with excellent fire safety. In this work, an organic–inorganic composite coating comprising nitrogen–phosphorus–silicon-containing flame retardant and silver nanoparticle-loaded halloysite nanotubes (Ag@HNTs) was designed and prepared to improve the fire safety of polyester-cotton fabrics. Microscale combustion colorimeter results indicated that the peak heat release rate of the modified polyester-cotton fabric with such a composite coating was reduced by 47%. Meanwhile, it could self-extinguish in 9 s after being ignited, and the limiting oxygen index was up to 25%, indicating excellent fire safety. In addition, the total smoke release of the coated polyester-cotton fabric was reduced by 21%, illustrating that the coating of Ag@HNTs could eliminate the smoke generated. The treated fabric also exhibited superior water resistance. Flame retardant mechanisms were well investigated using thermogravimetric analysis–infrared spectrometry analysis and chemiluminescence by studying the gaseous degradation products and hydroxyl radical in the gas phase. This work provides an effective approach to fabricating high-performance flame retardant and smoke-suppressive coatings for textiles.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Zijun Yan,Fangshun Ye,Liyue Xu,Xiao Yang,Shouqiang Lai,Shuli Wang,Yue Lin,Guolong Chen,Yijun Lu,Hao-Chung Kuo,Zhong Chen,Tingzhu Wu
Atomic layer deposition (ALD) plays a pivotal role in raising the long-term stability of perovskite quantum dot (PQD). The deposition temperature of excellent alumina film prepared by ALD is generally higher than 200 °C. In such a temperature environment, the lattice morphology of PQD is seriously damaged. In this work, to effectively protect PQD, the optimum temperature for depositing alumina on the surface of CsPbBr 3 PQD is investigated. The CsPbBr 3 PQD is deposited on a transparent glass substrate . Subsequently, an alumina layer is deposited on the surface of PQD via ALD at a deposition temperature of 40–120 °C. In our experiment, the significant degradation of PQD is observed when the deposition temperature of ALD is set to 80 °C and above. Lowering the deposition temperature can effectively improve the optical performance of PQD. The samples with alumina deposited at 75 °C show excellent stability after undergoing aging tests, and therefore 75 °C is considered the best ALD temperature. Besides, white light-emitting diode (W-LED) is produced by a method that a stack structure consisting of CsPbBr 3 coated via ALD at 75 °C and CdSe QD is excited using blue Micro-LED, and the color gamut of W-LED accounts for the wide area of 94.00% NTSC (1953) and 86.20% Rec.2020 displayed wide color gamut features. The experiment provides practical guidance for selecting the optimal deposition temperature for ALD-packaged PQD-based devices.
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Small
·
2023
·Vol. 19
·期 37
·2300841
·
IF 13.3
Yuhan Wang,Jin Wang,Meng Zhang,Song Zheng,Jiahui Wu,Tianren Zheng,Guocan Jiang,Zhengquan Li
Perovskite nanocrystals (PNCs) are promising candidates for solar-to-fuel conversions yet exhibit low photocatalytic activities mainly due to serious recombination of photogenerated charge carriers. Constructing heterojunction is regarded as an effective method to promote the separation of charge carriers in PNCs. However, the low interfacial quality and non-directional charge transfer in heterojunction lead to low charge transfer efficiency. Herein, a CsPbBr 3 –CdZnS heterojunction is designed and prepared via an in situ hot-injection method for photocatalytic CO 2 reduction. It is found that the high-quality interface in heterojunction and anisotropic charge transfer of CdZnS nanorods (NRs) enable efficient spatial separation of charge carriers in CsPbBr 3 –CdZnS heterojunction. The CsPbBr 3 –CdZnS heterojunction achieves a higher CO yield (55.8 µmol g −1 h −1 ) than that of the pristine CsPbBr 3 NCs (13.9 µmol g −1 h −1 ). Furthermore, spectroscopic experiments and density functional theory (DFT) simulations further confirm that the suppressed recombination of charge carriers and lowered energy barrier for CO 2 reduction contribute to the improved photocatalytic activity of the CsPbBr 3 –CdZnS heterojunction. This work demonstrates a valid method to construct high-quality heterojunction with directional charge transfer for photocatalytic CO 2 reduction. This study is expected to pave a new avenue to design perovskite–chalcogenide heterojunction.
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Journal of Marine Science and Engineering
·
2023
·Vol. 11
·期 5
·1001
·
IF 2.9
Yuefeng Gao,Baojiu Chen
Seawater pollution caused by heavy metal ions is a growing concern among the public. Perovskite quantum dots (PeQDs) are ideal probes for detecting metal ions due to their exceptional sensing characteristics, including remarkable sensitivity, low detection limit, and good selectivity. However, traditional lead-based PeQDs exhibit drawbacks related to lead toxicity and poor water stability. Herein, lead-free halide PeQDs Cs3Bi2Br9were synthesized using Bi3+instead of Pb2+via the ligand-assisted reprecipitation method. The luminescence performance of the precursor is analyzed with respect to the reaction conditions. The results reveal that the optimal reaction temperature is 80 °C, the ideal octylamine dosage is 35 μL, and the most effective reaction time is 10 min. Photoluminescence spectra of Cs3Bi2Br9are analyzed at various temperatures and demonstrate that fluorescence intensity decreases as temperature increases. The value of the exciton binding energy (Eb) is determined to be 88.6 meV. Cs3Bi2Br9PeQDs synthesized under the optimum reaction conditions are utilized as fluorescent probes to detect copper ions in seawater. Results from experiments demonstrate that the presence of copper ions markedly quenched the photoluminescence of Cs3Bi2Br9owing to the effective transfer of electrons from Cs3Bi2Br9to Cu2+. A strong linear correlation between the degree of quenching and the contents of Cu2+is observed. Cs3Bi2Br9PeQDs demonstrate a sensitivity and detection limit of 1.21 μM−1and 98.3 nM, respectively. Furthermore, this probe exhibits good photostability, water stability, and selectivity for copper ions, thereby indicating its potential for detecting marine heavy metal contaminants.
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