ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 19
·2011073
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IF 18.808
Huiying Chen,Linlin Zhou,Zhi Fang,Shuize Wang,Tao Yang,Laipan Zhu,Xinmei Hou,Hailong Wang,Zhong Lin Wang
Inorganic lead halide perovskite has become an emerging material for modern photoelectric and electronic nanodevices due to its excellent optical and electronic properties. In view of its huge dielectric and electrical properties, inorganic CsPbBr 3 perovskite is introduced into the piezoelectric nanogenerator (PENG). Based on one-step electrospinning of solutions containing CsPbBr 3 precursors and polyvinylidene difluoride (PVDF), in situ growth of CsPbBr 3 nanocrystals in PVDF fibers (CsPbBr 3 @PVDF composite fibers) with highly uniform size and spatial distribution are synthesized. The CsPbBr 3 @PVDF composite fibers based PENG reveals an open-circuit voltage ( V oc ) of 103 V and a density of short-circuit current ( I sc ) of 170 µ A cm −2 , where the V oc is comparable to the state-of-the-art hybrid composite piezoelectric nanogenerators (PENGs) and the density of I sc is 4.86 times higher than that of lead halide perovskites counterpart ever reported. Moreover, CsPbBr 3 @PVDF composite fibers based PENG exhibits fundamentally improved thermal/water/acid–base stabilities. This study suggests that the CsPbBr 3 @PVDF composite fiber is a good candidate for fabricating high-performance PENGs, promising application potentials in mechanical energy harvesting and motion sensing technologies.
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Journal of Analysis and Testing
·
2021
·Vol. 5
·期 1
·3-10
·
IF 0
Huang Guo-Bin,Guo Zhi-Yong,Ye Ting-Xiu,Zhang Chen,Zhou Yan-Mei,Yao Qiu-Hong,Chen Xi
Cubic phase CsPbBr 3 perovskite nanocrystals (PNCs) was prepared by a high-temperature hot-injection method. The high photoluminescence quantum yield (PLQY) of as-prepared CsPbBr 3 PNCs was 87%, which can be used for the determination of chloridion in domestic water samples based on their wavelength-shift characteristics via halide exchange. The proposal approach for the determination of chloridion reveals a linear correlation ranged from 10 to 200 μM of the chloridion concentration and the wavelength shift of CsPbBr 3 PNCs with a correlation coefficient of R 2 = 0.9956. The as-mentioned method reveals neglectable responses towards those co-existing ions in the water aside from chloridion, due to the quick exchange between Cl and Br and the outstanding color change caused by wavelength shift. The strategy has been applied to the determination of chloridion in water samples with the recoveries of 98.9–104.2% and the limit of detection (LOD) of 4 μM. These results show that the suggested approach is promising for the development of novel fluorescence detection for chloridion in water.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Shuyi Huang,Lei Tan,Lin Zhang,Jinyi Wu,Liguo Zhang,Youwen Tang,Hailong Wang,Yong Liang
The preparation of molecularly imprinted mesoporous silica with perovskite quantum dots (QDs) grown in situ and their applications for highly sensitive fluorescence sensing of 2,2-dichlorovinyl dimethyl phosphate (DDVP) is presented. Highly ordered mesoporous silica materials were synthesized and employed as solid supports. Uniform and highly luminescent CsPbBr 3 QDs were grown in the pores of these mesoporous silica. Subsequently, surface graft imprinting was applied on the surface of the QDs-encapsulated mesoporous silica. The QDs were acted as a recognition signal transducer and the molecular imprinting process provided recognition sites for 2,2-dichlorovinyl dimethyl phosphate. The QDs grown in situ in SBA-15 mesopores greatly improved the sensitivity for the determination of 2,2-dichlorovinyl dimethyl phosphate. Under the optimized conditions, the QDs-encapsulated molecularly imprinted mesoporous silica was linear between the concentration of 5 and 25 μg/L for DDVP, and detection limit was 1.27 μg/L. The QDs-encapsulated molecularly imprinted mesoporous silica was subsequently applied to the fluorescence analysis of 2,2-dichlorovinyl dimethyl phosphate in cabbage and lettuce samples and achieved recoveries from 87.4% to 101%. The time-resolved photoluminescence decay and UV–vis spectroscopic studies indicated that the quenching mechanism on the fluorescence of the QDs can be attributed to charge transfer between the QDs and DDVP.
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Solar RRL
·
2021
·Vol. 5
·期 8
·2100344
·
IF 8.582
Mingran Sun,Jingwei Zhu,Benlin He,Fan Bu,Junjie Ti,Xinpeng Yao,Haiyan Chen,Yanyan Duan,Qunwei Tang
The passivation of defects at perovskite films, surfaces and the promotion of charge extraction across perovskite/carbon back interface are of vital importance to develop the power conversion efficiency (PCE) and stability of carbon-based perovskite solar cells (PSCs) free of hole-transporting layers (HTLs). Herein, an electron donor material with polyamino groups, hexamethylenetetramine (HMTA), is used as an efficient surface modifier for tribrominated all-inorganic perovskite films. The modification with HMTA not only eliminates the defects by forming a bond between N atoms and positively charged ions but also optimizes the energy level structure of the perovskite film and back interface contact. Therefore, CsPbBr 3 films with decreased trap states, extended carrier lifetimes, and enhanced hole mobility are gained, which significantly restrains charge recombination and energy loss as well as facilitates charge extraction and transfer at the perovskite/carbon interface. Finally, an improvement of PCE from 6.75% to 10.08% is obtained for carbon-based HTL-free CsPbBr 3 PSCs without and with HMTA modification, respectively. Furthermore, the HMTA-modified device without encapsulation presents an enhanced long-term moisture and heat stability after being stored in the atmospheric environment with 80% relative humidity (RH) at 25 °C and 20% RH at 85 °C, respectively, due to the reduced defects and the improved hydrophobicity of perovskite film.
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Advanced Materials Interfaces
·
2021
·Vol. 8
·期 19
·2100588
·
IF 6.147
Jie Guan,Ying-zhuo Shen,Yun Shu,Dangqin Jin,Qin Xu,Xiao-Ya Hu
The high photoluminescence quantum yield (PLQY) of perovskite nanocrystals (PNCs) makes them promising candidates in optoelectronics. However, the easy loss of structural integrity and fast chemical degradation upon exposure to moisture influence their reliable applications in aqueous solutions. Here, a hierarchical surface construction strategy is rationally designed to fulfill an internal–external stabilization of PNCs. Carbon quantum dots (CQDs) and cetyltrimethyl ammonium bromide (CTAB) have been demonstrated stabilized PNCs internally by eliminating the proton transfer-induced ligand desorption. Meanwhile, CTAB acts as a cationic surfactant in consolidating the subsequent SiO 2 coating to prevent the PNCs from external environments. Based on the resulted PNCs, a sensitive and selective fluorescence film sensor for Fe 3+ detection is successfully constructed. The fluorescence of PNCs at 525 nm is quenched after the addition of Fe 3+ in the concentration range from 770 p m to 411 µ m . As Fe 3+ ions attached to the surface of the film are removed with water, the fluorescence of the film can be easily recovered. Owing to this character, the application of the PNCs toward the confidential information encryption has been proved. This work provides an effective design strategy to improve the stability of PNCs and extends their applications in sensing and encryption areas.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Feng Wang,Hongye Wang,Asghar Ali,Yimeng Zhang,Xiaoqiang Cui,Yang Liu
Herein, green luminescence poly-vinylidene fluoride (PVDF) encapsulated CsPbBr 3 nanocrystals (CsPbBr 3 @ PVDF) with full width at half maximum (FWHM) of 20 nm were successfully prepared through one-pot electrospray process. The as prepared perovskite spheres showed outstanding stability in water, and displayed low cytotoxicity, which were applied for cell membrane imaging.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 19
·5113-5121
·
IF 5.976
Zehao Song,Hai Zhou,Pengbin Gui,Xiaohan Yang,Ronghuan Liu,Guokun Ma,Hao Wang,Guojia Fang
Self-powered light-emitting photodetectors (SLEPs) can simultaneously transmit and receive information using light, offering huge potential for applications in interactive communication systems. However, high-performance SLEPs are very hard to achieve due to the seriously contradictory principles of carrier transport in SLEPs. In this study, a novel structure based on a ZnO hollow ball/CsPbBr3 heterojunction, in which ZnO hollow balls function as an ultraviolet (UV) response center and CsPbBr3 is designed to be a green light-emitting material, is reported as a high-performance SLEP. Since the ZnO hollow balls have superior light trapping characteristics for UV light, the device shows a huge UV response with the on/off ratio and detectivity up to 16 527 and 2.4 × 1013 Jones, respectively. Moreover, it displays blue emission with a low threshold voltage because of CsPbBr3. Compared with the traditional ZnO/GaN structure devices, the device showed enhanced dual-functional performance at various wavelengths due to the insertion of CsPbBr3, which resulted in a better contact interface and green-light emission center. Our structure separating the light-responsive and emitting active regions avoids the contradictory principles of carrier transport, which may provide new access to gain high-performance dual-functional devices.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 7
·1-13
·
IF 2.02
Yang Liu,Li Dongmei,Wang Cong,Yao Wei,Wang Hao,Huang Kaixiang
Currently, all-inorganic cesium lead-halide perovskite nanocrystals have attracted enormous attentions owing to their excellent optical performances. While great efforts have been devoted to CsPbBr 3 nanocrystals, the perovskite-related Cs 4 PbBr 6 nanocrystals, which were newly reported, still remained poorly understood. Here, we reported a novel room-temperature reaction strategy to synthesize pure perovskite-related Cs 4 PbBr 6 nanocrystals. Size of the products could be adjusted through altering the amount of ligands, simply. A mixture of two good solvents with different polarity was innovatively used as precursor solvent, being one key to the high-yield Cs 4 PbBr 6 nanocrystals synthesis. Other two keys were Cs + precursor concentration and surface ligands. Ingenious experiments were designed to reveal the underlying reaction mechanism. No excitonic emission was observed from the prepared Cs 4 PbBr 6 nanocrystals in our work. We considered the green emission which was observed in other reports originated from the avoidless transformation of Cs 4 PbBr 6 into CsPbBr 3 nanocrystals. Indeed, the new-prepared Cs 4 PbBr 6 nanocrystals could transform into CsPbBr 3 nanosheets with surface ligands mediated. The new-transformed two-dimensional CsPbBr 3 nanosheets could evolve into large-size nanosheets. The influences of surface ligand density on the fluorescent intensity and stability of transformed CsPbBr 3 nanosheets were also explained. Notably, the photoluminescence quantum yield of the as-transformed CsPbBr 3 nanosheets could reach as high as 61.6% in the form of thin film. The fast large-scale synthesis of Cs 4 PbBr 6 nanocrystals and their ligand-mediated transformation into high-fluorescent CsPbBr 3 nanosheets will be beneficial to the future optoelectronic applications. Our work provides new approaches to understand the structural evolution and light-emitting principle of perovskite nanocrystals.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Peng Chen,Wenwen Wang,Ping Zhang,Yanyan Cui,Longfei Ruan,Xueling Chang
Lead halide perovskite nanocrystals (NCs) have become a promising emerging material with significant potential in the field of micro-optoelectronic devices for their excellent optical properties. However, their inherent poor stability and low carrier separation efficiency have seriously hindered their potential applications under certain circumstances. Constructing 3D/2D semiconductor heterostructures with comprehensive advantages offers an effective way to improve the performance of all inorganic lead halide perovskites. In this study, we synthesized a heterostructure nanomaterial about an island-like 3D CsPbBr3 NCs on 2D graphene nanosheets (GNS) using a chemical solution method with in situ controlled growth at room temperature. Using GNS as a substrate, we controlled the proportion of perovskite NCs and GNS, accurately regulated the area of isolated perovskite NCs on the surface of graphene, and regulated the photoelectric properties of the heterostructure nanomaterials. The carrier separation efficiency of the heterostructures was enhanced, and the optimal charge-transfer rate constant and energy-transfer efficiency were as high as 31.7 × 107 s–1 and 77.4% values, respectively. The 3D/2D perovskite/graphene heterostructures exhibited superior stability in polar solvents and at high temperatures. The heterostructure nanomaterials maintained good fluorescence stability at 160 °C and continue to emit even at 200 °C. Furthermore, the heterostructures also exhibited a steady photoelectric response, carrier transport, and cycle performance under similar extreme conditions, indicating broad applications for micro-optoelectronic devices.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Jianlin Chen,Zihan Wu,Shu Chen,Wei Zhao,Yu Zhang,Wenxia Ye,Ruoxi Yang,Li Gong,Zhuoyin Peng,Jian Chen
Zinc oxide nanorod arrays (ZnO NRAs) have been previously introduced as electron transport layer (ETL) of perovskite solar cells (PSCs) due to their high electron mobility and unique textured morphology. However, the presence of hydroxyl and oxygen vacancies on the surface of bare intrinsic ZnO NRAs may act as defect centers leading to carrier nonradiative recombination and the device photovoltaic performance degradation. Here, we propose a mutilayer SnO 2 /Al-doped ZnO nanorod arrays/SnO 2 (SnO 2 /AZO NRAs/SnO 2 ) composite to be utilized as ETL of all-inorganic CsPbBr 3 PSCs. The influence of AZO NRAs with various Al ion (Al 3+ ) doping content on the performance of CsPbBr 3 PSCs was explored. The hole-free carbon-based CsPbBr 3 PSCs with an architecture of FTO/SnO 2 /AZO NRAs/SnO 2 /CsPbBr 3 /carbon based on 1 at% AZO NRAs exhibited the best photovoltaic performance with a champion power conversion efficiency (PCE) of 7.11 %, open-circuit voltage ( V oc ) of 1.46 V, short-circuit current density ( J sc ) of 6.88 mA/cm 2 , and fill factor ( FF ) of 71.1 %, compared with the bare intrinsic ZnO-based counterpart with a PCE of 3.45 %, V oc of 0.80 V, J sc of 8.46 mA/cm 2 , and FF of 51 %, respectively. The photovoltaic performance enhancement can be atrributed to enhanced light collection and electron extraction capability, with lower open-circuit voltage loss and more suitable interface band alighment. It is notable that the AZO NRAs were prepared by a facile electrodeposition approach to obtain large-area textured ETLs. This strategy may also be applicable to the photovoltaic performance improvemet of all types of PSCs.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jie Liu,Tongxu Gu,Rui sun,Jiaojiao Sun,Jian Yin,Pengli Bai,Huancai Yin
Classical gold nanoparticle-based colorimetric immunochromatographic assay (ICA) exhibits moderate performance, limiting their application in trace detection. In this study, perovskite-MSN nanocomposites with high quantum yield (74.7 %), a narrow full width at half maximum (29.5 nm) and excellent water stability were synthesized using in situ crystallization growth and a water-assisted strategy. Carboxyl-modified perovskite-MSN nanocomposites were employed to label anti-gliadin monoclonal antibody (mAb) and construct dual-mode fluorescent ICA (FICA) for determination of gliadin in milk and beef samples. Compared to the traditional AuNP-based colorimetric ICA strips, the CsM-H-based FICA demonstrated improved sensitivity, with a limit of detection (LOD) of 3.62 ng/mL in quantitative analysis. The CsM-H-based FICA strips exhibited average recoveries ranging from 90.2 % to 110.0 %, with coefficients of variation (CVs) between 3.3 % and 7.4 % for milk and beef samples. The ultra-stable perovskite-MSN nanocomposites provided the FICA strip with excellent stability, enabling storage for up to six months at room temperature. This study highlights the advantages of CsM-H-based FICA, including its rapidity, simplicity, and cost-effectiveness, as a promising POCT biosensor.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·Vol. 26
·期 15
·12179-12187
·
IF 2.9
Jinwei Liu,Rong Lu,Anchi Yu
CsPbBr3 nanoplatelets (NPLs), as some of the two-dimensional lead halide perovskites, have been intensively investigated due to their outstanding photophysical and photoelectric properties. However, there remain unclear fundamental issues on their carrier kinetics and the low-energy tail in their photoluminescence (PL) spectrum. In this paper, we synthesized CsPbBr3 NPLs with five [PbBr6]4− monolayers and performed comprehensive studies by using steady-state absorption, PL, and femtosecond transient absorption (fs-TA) spectroscopic measurements. We determined both the biexciton Auger recombination time (7 ± 2 ps) and trapped exciton lifetime (110 ± 15 ps) of the five monolayer CsPbBr3 NPLs. We also investigated the origin of the low-energy tail emission in their PL spectrum. More importantly, we found that a negative ΔA feature in the energy range of 2.45–2.55 eV appears in their fs-TA spectrum at 2, 4 and 10 ps delay times, which could help them act as a laser gain medium. The low-energy tail emission in their PL spectrum overlaps well with the negative ΔA feature in the energy range of 2.45–2.55 eV in their fs-TA spectrum at 2, 4 and 10 ps delay times.
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