NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 26
·11688-11696
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IF 2.7
Han Wang,WenJing Gao,Yangjie Li,Yang He,Haihu Yu
Cesium lead halide (CsPbX3, X = Cl, Br, and I) perovskite nanocrystals (PNCs) have become attractive materials for fluorescence sensing in recent years due to their excellent photoluminescent properties. Because of their ionic properties, PNCs are unstable in polar solvents, making it difficult for them to detect substances in water. Some methods are useful, such as non-homogeneous phase sensing and wrapping an inert layer around the surface of PNCs. However, these methods reduce the sensing efficiency and hinder the interaction of PNCs with sensing substances. In addition, the encapsulated PNCs are more likely to undergo fluorescence quenching and decreased storage stability. In this work, (3-aminopropyl)trimethoxysilane (APTMS) was used to synthesize APTMS PNCs (A-PNCs) by a hot injection one-pot method, and they exhibited satisfactory fluorescence properties, stability, and monodispersity. By introducing ethanol to form a water–ethanol–hexane homogeneous system, the A-PNCs were able to increase their anion-exchange capacity after directly interacting with chloride ions (Cl−) in water. Based on the fluorescence wavelength variation of the A-PNCs, testing for Cl− in human sweat was accomplished in 1 minute, with the advantages of fast speed, high precision, and satisfactory stability. On this basis, the reacted A-PNCs were immobilized on the film with bright fluorescence and color stability, and their tricolor (RGB) values were extracted for visual sensing. Thus, well-dispersed A-PNCs in hexane can rapidly detect chloride ions in water, which will enhance the application of perovskite materials for sensing in polar solvents.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qiliang Zhu,Wenxuan Huang,Jianhua Shen,Haibo Jiang,Yihua Zhu,Chunzhong Li
Metal halide perovskite nanocrystals have garnered significant attention in the realm of photocatalytic CO 2 reduction in recent years owing to their remarkable reducing properties and high selectivity. However, the issue of low photocatalytic activity due to severe carrier recombination phenomena in perovskite has posed a significant challenge. To address this, a one-pot in-situ preparation strategy was employed to create a BiOBr/Bi-doped perovskite nanocrystal S-scheme heterojunction, resulting in a significant improvement in the CO 2 photoreduction performance. The heterojunction material exhibited a CO yield of 151.56 μmolg -1 h −1 , with a selectivity for CO of 93.6 %. The molar ratio of the components was modulated using an in-situ water aging strategy, yielding a photocatalyst performance that exceeded that of pure BiOBr. The synthesis strategy of one-step in-situ preparation of heterojunctions overcomes the problem of insufficient bonding caused by two-step methods. And various characterizations and DFT calculations strongly support the S-scheme mechanism of the photocatalyst. The active site effectively reduces the energy barrier for the transition from *COOH to *CO intermediate, thereby significantly improving photocatalytic activity.
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Journal of Physical Chemistry C
·
2024
·
IF 3.3
Shipei Sun,Peng Huang,Xian-gang Wu,Cuili Chen,Xiangmin Hu,Zelong Bai,Anatoly Pushkarev,Haizheng Zhong
The ligand exchange of perovskite nanocrystals is crucial for achieving highly efficient and stable light-emitting diodes (PeLEDs). Here, we report the shape transformation of CsPbBr3 nanocrystals from dodecahedron to cube during the ligand exchange using dimethylammonium bromide (DDAB). The shape transformation is thoroughly investigated by experimental characterization and density functional theory calculations, revealing the surface selective etching effect of DDAB. Among the {002}, {220}, and {112} facets in dodecahedron CsPbBr3 nanocrystals, DDAB has the highest binding energy with the (220) facet, which accounts for surface selectivity and shape transformation. PeLEDs based on DDAB-capped CsPbBr3 nanocrystals exhibit average and maximum external quantum efficiencies (EQE) of 14.6 and 18.5%, respectively. Therefore, the ligand exchange using DDAB is an effective strategy for the production of high-quality perovskite nanocrystals for optoelectronic applications.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 2
·1-8
·
IF 5.3
Xu Kun,Dai Li,Du Yu,Liu Lei,Zhang Nuo,Feng Ruiqing,Xu Rui,Wei Qin
A photoelectrochemical (PEC) immunosensor was designed based on MgIn 2 S 4 -decorated inorganic halide perovskite CsPbBr 3 combined with the signal polarity conversion strategy for neuron-specific enolase (NSE) detection. CsPbBr 3 was applied as the basic photoactive material owing to its excellent optical and electronic properties, which provide a good PEC performance for sensor construction. In order to improve the stability of this perovskite, the three-dimensional flower-like MgIn 2 S 4 with a desirable direct band gap was applied to enhance the PEC response. Also, the excellent structure of MgIn 2 S 4 provides large surface-active sites for CsPbBr 3 loaded. For enhancing the detection sensitivity of PEC immunosensor, p-type CuInS 2 was used as a signal probe which fixed on detection antibody (Ab 2 ). When the target NSE was present, the photogenerated electrons produced by CuInS 2 were transferred to the test solution, and the polarity of PEC signal changes. Based on the above photosensitive materials and signal conversion strategy, the proposed PEC immunosensor showed favorable detection performance, and the linear detection range is 0.0001 ~ 100 ng/mL with a 38 fg/mL of detection limit. The proposed strategy improved the adhibition of CsPbBr 3 in the analytical chemistry field as well as provided a reference method for other protein detections. Graphical Abstract
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JOURNAL OF APPLIED PHYSICS
·
2024
·Vol. 135
·期 8
·
IF 2.7
Xu Xiaoli,Jiang Hongtao,Liu Wangwang,Wang Shengyi,Wang Xiaoping,Wang Mengyu,Ma Wei,Ma Shuyi,Wei Jinsha
It is a novel-effective process for realizing high-efficiency sensing and continuous gas monitoring by introducing precious metals into metal–oxide–semiconductors (MOSs). In this study, Ag is exploited to prepare surface functionalized SnO 2 nanoparticles (NPs) and innovative x Ag@SnO 2 /CsPbBr 3 , activating and catalyzing the gas sensing reactions on semiconductors. The results show that the precious metal Ag NPs promote the directional transport of carriers, thus improving the gas sensing performances. In addition, innovative x Ag@SnO 2 /CsPbBr 3 composites originated from Ag@SnO 2 NPs and 3-mercaptopropionic acid treated all-inorganic perovskite CsPbBr 3 are constructed to further accelerate electron transfer on heterointerfaces, enabling continuous and efficient monitoring of ethanolamine (EA) at room temperature. The sensing properties of Ag@SnO 2 /CsPbBr 3 on various volatile organic compounds are investigated. Compared with pure CsPbBr 3 , the EA response of as-prepared 2Ag@SnO 2 /CsPbBr 3 is obviously improved by about sevenfold. The response/recovery time is greatly shortened, besides the good stability. Another interesting result for x Ag@SnO 2 /CsPbBr 3 is the lower limit of detection of 44.43 ppb. The work demonstrates that Ag modification facilitates the adsorption/desorption rate and the response. Furthermore, the catalytic activation of noble metal Ag NPs and the synergistic interaction of SnO 2 /CsPbBr 3 nano-heterojunctions promote EA sensing performances at room temperature.
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ChemSusChem
·
2024
·
IF 7.5
Dong Li,Kaixuan Wang,Ying Chen,Renyi Li,Jiahong Tang,Yizhou Zhao,Wei Guo,Qi Chen,Yujing Li
Graphical A 0D/1D CPB@TCN heterojunction photocatalyst for CO 2 reduction is synthesized by immobilizing CsPbBr 3 (CPB) quantum dots on one-dimensional porous tubular g-C 3 N 4 (TCN). The strong Pb−N chemical bonding between CPB quantum dots and TCN provides a fast charge transfer channel for the CPB@TCN, which promotes the efficient separation and transfer of photogenerated carriers, resulting in excellent photocatalytic activity. Halide perovskite CsPbBr 3 (CPB) quantum dots (QDs) are considered as a promising candidate for solar-driven CO 2 conversion for their unique optoelectronic properties and suitable band structures. However, the CO 2 conversion efficiency of pristine CsPbBr 3 quantum dots is severely limited due to their rapid electron-hole pair recombination and insufficient active sites. In this study, by immobilizing CPB QDs onto one-dimensional (1D) porous tubular g-C 3 N 4 (TCN), an effective 0D/1D CPB@TCN heterojunction photocatalyst for CO 2 reduction is fabricated. Density functional theory (DFT) calculations combined with experimental studies demonstrate that CPB QDs are uniformly anchored on the surface of TCN through Pb−N chemical bonding, resulting in efficient separation and transfer of photogenerated carriers in CPB@TCN photocatalysts. The resultant CPB@TCN photocatalysts exhibit significantly enhanced photocatalytic activity for CO 2 reduction with the highest conversion rate of 22.62 μmol g −1 h −1 , which is 5.33-times higher than that of pristine CPB QDs. This work unveils the interfacial bonding mechanism of CPB@TCN heterojunction through Pb−N chemical bond, which provides new insights for the development perovskite-based heterojunction photocatalysts.
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Materials Advances
·
2024
·
IF 5.2
Premkumar Sellan,Manigandan Selvan,Abida Perveen,Din Nasrud,Sakthivel Chandrasekar,Pitchaikannu Venkatraman,Devaraj Nataraj,Byung Seong Bae,Damian Chinedu Onwudiwe,Lei Wei
Perovskite materials are potential photo-absorbers, and their solution-processed perovskite layers are widely reported in photodetection devices. However, defects in perovskites pose a serious challenge to device performance. One possible way to overcome this set-back is growing a perovskite single crystal and deploying it in photon detection devices. Herein, we report the growth of pure and Bi-doped CsPbBr3 perovskite single-crystals and their high-energy photodetection characteristics. The Bi-doped CsPbBr3 perovskite single-crystals exhibited good photodetection characteristics in the visible, X-ray and gamma-ray regions. Under an illumination of 470 and 530 nm, the Bi-doped CsPbBr3 perovskite single-crystal photodetector displayed a linear response for the biasing voltage ranging from 2 V to 5 V. The device displayed a higher magnitude of photocurrent and exhibited a better ON/OFF ratio of ∼596 at λ = 470 nm and ∼24 at λ = 530 nm. The gamma ray detection properties of the Bi-doped CsPbBr3 perovskite single crystal were studied using two different radioactive sources with varying activity levels. A characterization study using a portable X-ray device revealed an excellent response to varying tube voltages and currents. The present study reveals the versatility of the Bi-doped CsPbBr3 perovskite single-crystals in photon detection under a wide range of illumination.
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ACS Nano
·
2024
·
IF 15.8
Cancan Li,Xiao Li,Xiang Liu,Lindong Ma,Hui Yan,Lei Tong,Zhibo Yang,Jiaxing Liu,Deyu Bao,Jikun Yin,Xiujun Li,Peng Wang,Rong Li,Lei Huang,Miao Yu,Sitong Jia,Tie Wang
The growth of all-inorganic perovskite single-crystal microstructures on substrates is a promising approach for constructing photonic and electronic microdevices. However, current preparation methods typically involve direct control of ions or atoms, which often depends on specific lattice-matched substrates for epitaxial growth and other stringent conditions that limit the mild preparation and flexibility of device integration. Herein, we present the on-substrate fabrication of CsPbBr3 single-crystal microstructures obtained via a nanoparticle self-assembly assisted low-temperature sintering (NSALS) method. Sintering guided by self-assembled atomically oriented superlattice embryos facilitated the formation of single-crystal microstructures under mild conditions without substrate dependence. The as-prepared on-substrate microstructures exhibited a consistent out-of-plane orientation with a carrier lifetime of up to 82.7 ns. Photodetectors fabricated by using these microstructures exhibited an excellent photoresponse of 9.15 A/W, and the dynamic optical response had a relative standard deviation as low as 0.1831%. The discrete photosensor microarray chip with 174000 pixels in a 100 mm2 area showed a response difference of less than 6%. This method of nanoscale particle-controlled single crystal growth on a substrate offers a perspective for mild-condition preparation and in situ repair of crystals of various types. This advancement can propel the flexible integration and widespread application of perovskite devices.
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 25
·9247-9254
·
IF 5.7
Zhaolin Song,Menghua Zhu,Sixin Chen,Meng Xu,Wanqi Jie
All-inorganic halide perovskite CsPbBr3 with superior environmental stability, remarkable radiation hardness and great defect tolerance has emerged as a competitive material in radiation detection. However, the operational stability of CsPbBr3 based detectors remains a problem due to their unstable electrical properties. Perovskite nanowires with a preferred orientation show greater accessibility compared with their single-crystal partners that undergo time-consuming growth. However, the synthesis of perovskite nanowire arrays with excellent stability, tunable distribution arrangements and adjustable compositions has been a major challenge. Herein, CsPbBr3 perovskite columnar crystal films with a controlled diameter (50–400 nm) are successfully synthesized with porous anodic aluminum oxide (AAO) templates. The passivated surface between AAO and CsPbBr3 nanowires resulted in reduced ion migration and stable operation performance. The CsPbBr3 based X-ray detectors display a low dark current drift of 2.185 × 10−6 nA cm−1 s−1 V−1, a high resistivity of 3.946 × 1011 Ω cm and a detection limit of 3.70 μGyair s−1 with an AAO pore size of 50 nm. This work establishes a suitable method to synthesize all-inorganic perovskite nanowires with controlled diameters for stable X-ray detection performance.
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ACS Photonics
·
2024
·
IF 6.5
Guixiang Xie,Qilong Li,Xiaochun Lu,Longtao Li
Organic–inorganic hybrid perovskite solar cells (PSCs) have shown impressive photoelectric conversion efficiency (PCE) but suffer from inevitable degradation when exposed to air and light. Replacing the organic cations with inorganic Cs+ to yield all-inorganic CsPbX3 perovskites can improve the stability under environmental pressure. Among them, cesium lead bromide (CsPbBr3) perovskite shows great environmental tolerance under illumination, humidity, heat, and oxygen attack. However, the energy gap between the carbon electrode and CsPbBr3 limits the carrier separation–transfer rate. Herein, p-type charge-transfer-doped NiO nanocrystals are employed as hole transport materials in all-inorganic CsPbBr3 PSCs with a fluorine-doped tin oxide (FTO)/SnO2/CsPbBr3/NiO-l-Cys/carbon structure. This combination reduces the charge-carrier recombination by decreasing the hole transport potential energy-level barrier between the perovskite and the hole transport layer. The coordination of the energy structure associated with the interfacial charge extraction–transfer action leads to a remarkable enhancement in PCE (9.61%) and a much higher open-circuit voltage (1.614 V), surpassing those achieved by hole-free devices (7.35% and 1.504 V, respectively). The PSC device assembled with NiO nanocrystals displays good stability under high humidity and temperature for 30 days. The greatly improved PCE, coupled with good stability, demonstrates the great potential of l-cysteine-doped NiO for future use as a hole-transporting material in all-inorganic PSCs.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 51
·2208065
·
IF 19.924
Longfei Yuan,Dewang Li,Hongli Liu,Fei Zhang,Shirong Wang
CsPbBr 3 quantum dots (QDs) prepared through traditional hot-injection and room temperature reprecipitation methods are usually hexahedral (nanoplate/cube) and green-emitting. These methods severely obstruct the development of blue perovskite-based light-emitting diodes (PeLEDs) because the resultant QDs always suffer unachievable morphology regulation. Here, highly efficient blue-emitting rhombic dodecahedron CsPbBr 3 QDs (CsPbBr 3 <12> QDs) are obtained by regulating morphological transformation for the first time through a novel and facile sequential post-treatment strategy. Hydrobromide (-NH 3 + ) with stronger adsorption energy promotes the morphology transform of QDs from nanoplate to cube by substituting oleylamine in the first step. Then, polar solvent vapor eliminates PbX 6 4− and led to the (112) crystal plane of the cube QDs being exposed, which is effectively stabilized by -NH 3 + to realize morphology transition from cube to the dodecahedron. Highly efficient 12-faceted dodecahedrons are endowed with significantly enhanced photoluminescence quantum yield of 89.8% at 476 nm as well as uniform size distribution and mono-dispersity. The target blue PeLEDs achieve the maximum external quantum efficiency of 6.6% (480 nm) and excellent spectrum stability. This study provides a new strategy to prepare blue-emitting CsPbBr 3 <12> QDs by delicate control toward the growth and polyhedron process of crystal.
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ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 43
·1804394
·
IF 13.325
Junpeng Zeng,Xiaoming Li,Ye Wu,Dandan Yang,Zhiguo Sun,Zehao Song,Hao Wang,Haibo Zeng
All-inorganic halide perovskite is considered as outstanding candidate of organic–inorganic hybrid perovskite due to its superior stability. However, the low solubility of precursor and uncontrollable film growth result in poor film quality and impede the application of polycrystalline films greatly. In this work it is reported on a space-confined growth strategy to overcome the low solubility and fast crystal growth disadvantages via freezing the precursor solution within the gaps of ordered polystyrene sphere templates. Then, the dense CsPbBr 3 polycrystalline films realize low trap density (3.07 × 10 12 cm −3 ) and high carrier mobility (9.27 cm 2 V −1 s −1 ) after stoichiometric modulation. Photodetectors based on these films exhibit high performance in all figures of merit. Specifically, high responsivity up to 216 A W −1 and ultrashort response time (<5 µs) are achieved, which are better than those of all the CsPbBr 3 based PDs. A record detectivity of 7.55 × 10 13 and 3.1 × 10 5 Hz −3 dB bandwidth are also achieved. This work opens the window of high quality all-inorganic halide perovskite polycrystalline films and can be extended to rational application of more optoelectronic devices including solar cells, photoelectrodes, and ray detectors.
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