OPTICAL MATERIALS
·
2025
·
IF 4.2
Chenxi Bao,Mingrui Liu,Chuanqing Sun,Yu Liang,Yu Duan,Wenyu Zhao
Rare-earth compounds have been emerging as promising materials for infrared radiative cooling in electronic devices, owing to their exceptional thermal stability, tunable optical properties, and unique phonon-mediated thermal emission within the atmospheric transparency window. This study investigates the infrared (IR) emission behavior of various rare-earth (REPO 4 ) phosphates, focusing on the influence of rare earth ion species, structural characteristics, and temperature effects on their spectral properties. Three distinct morphologies of REPO 4 (RE = Y, Ce, Sm) nanopowders were successfully synthesized via a precipitation method using citric acid as metal ion complexing agent. It is discovered that spherical YPO 4 particles enhance lateral IR scattering and promote IR absorption. Additionally, the IR emissivities of all three samples are significantly influenced by oxygen vacancies and the band gap. Oxygen vacancies increase the free carrier concentration, which enhances IR emissivity, while a reduction in the band gap lowers the energy barrier for electron transitions, facilitating IR absorption. The synergistic effects of these factors yield a remarkable broadband IR emissivity of up to 0.966 for YPO 4 . The composite film created by embedding REPO 4 into PDMS achieved a cooling effect of up to 8.1 °C at an input power of 8 W (power density of 5000 W/m 2 ), demonstrating its effectiveness for cooling electronic devices. These findings indicate the great potential of rare-earth phosphates in advancing sustainable radiative cooling technologies for next-generation electronics.
研究领域:
材料科学
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纳米技术
·
光学性质
·
热管理
·
红外辐射
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE COMMUNICATIONS
·
2023
·
IF 2.1
Fan Sun,Xiaoxiao Yan,Zijing Zhang,Zhongnan Guo,Wenxia Yuan
The transition metal phosphorus trichalcogenides are fascinating two dimensional (2D) materials with expansive potential in optoelectronic devices , catalysis and energy storage. The van der Waals gap in structure gives a permit for rich intercalation chemistry , which could induce novel properties. In this work, we report the chemical intercalation in CdPS 3 single crystals utilizing liquid ammonia method. It is demonstrated that the co-intercalation of alkali metal (Li or K) and NH 3 molecule occurs during the intercalation reaction, leading to significantly enlarged layer distances (9.347–9.438 Å). The oxidation state of Cd in intercalated phases is clearly deceased compared to the parent CdPS 3 , which is ascribed to the charge transfer from the s orbitals of alkali metals to the 3 d orbitals of Cd during intercalation. The charge transfer also largely narrows the optical gap of CdPS 3 from 3.32 eV to 1.50 eV in K-intercalated phase, inducing visible-light response in this layered material. It is interesting to note that for the first time we report the successful chemical intercalation in transition metal phosphorus trichalcogenides with the single crystal form , instead of the polycrystalline sample. The intercalated products obtained by liquid ammonia method are still in single crystal form, which will facilitate the further mechanical or chemical exfoliation to synthesize new 2D materials.
✓ 已验证
DOI
高影响因子
Geoscience Frontiers
·
2020
·Vol. 12
·期 2
·957-963
·
IF 4.202
Ruijing Fu,Yaping Chen,Lingrui Wang,Zhiwei Ma,Pengfei Lv,Ying Song,Songrui Yang,Guanjun Xiao,Bo Zou
SiO 2 is the major mineral substance in the upper mantle of the earth. Therefore, studies of the silica-coated materials under high-pressure are essential to explore the physical and chemical properties of the upper mantle. The silica-confined CsPbBr 3 nanocrystals (NCs) have recently attracted much attention because of the improved photoluminescence (PL) quantum yield, owing to the protection of silica shell. However, it remains considerable interest to further explore the relationship between optical properties and the structure of CsPbBr 3 @SiO 2 NCs. We systemically studied the structural and optical properties of the CsPbBr 3 @SiO 2 NCs under high pressure by using diamond anvil cell (DAC). The discontinuous changes of PL and absorption spectra occurred at ∼1.40 GPa. Synchrotron X-ray diffraction (XRD) studies of CsPbBr 3 @SiO 2 NCs under high pressure indicated an isostructural phase transformation at about 1.36 GPa, owing to the pressure-induced tilting of the Pb-Br octahedra. The isothermal bulk moduli for two phases are estimated about 60.0 GPa and 19.2 GPa by fitting the equation of state. Besides, the transition pressure point of CsPbBr 3 @SiO 2 NCs is slightly higher than that of pristine CsPbBr 3 NCs, which attributed to the buffer effect of coating silica shell. The results indicate that silica shell is able to enhance the stabilization without changing the relationship between optical properties and structure of CsPbBr 3 NCs. Our results were fascinated to model the rock metasomatism in the upper mantle and provided a new ‘lithoprobe’ for detecting the upper mantle.
研究领域:
材料科学
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高压物理
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纳米材料
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光学性质
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地球物理学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Ruiqing Li,Haidong Jiang,Yunpeng Yao,Huang Ye,Xitao Liu,Shuang Chen,Junhua Luo
Motivated by the high performance of optoelectronic devices, organic–inorganic hybrid perovskites (OIHPs), particularly three-dimensional (3D) OIHPs, have taken a promising position in optoelectronic devices, owing to their high absorption coefficient, long carrier lifetime, and superior conversion efficiency. However, 3D OIHPs inevitably suffer from destruction under moisture operating conditions; it is a great struggle to synchronously realize high performance and long-term stability in optoelectronic devices. Herein, bulk single crystals (6 × 2 × 1.5 mm3) of the 3D hybrid perovskitoid (C6H10N2)Pb2Br6 (1, C6H10N22+ = N,N′-dimethyl-pyrazinium) have been grown successfully, which exhibit an excellent light absorption capacity (730 nm) and superior stability. Based on the bulk crystals of 1, photodetectors are fabricated with an extremely low dark current (3.5 pA), large current on/off ratio (>103), considerable responsivity (R, 4 mA W–1), and detectivity (D*, 4 × 1010 Jones). Strikingly, these devices possess excellent working stability (over 90 days) under ultralong air exposure, which are much better than most of the reported 3D OIHP devices. Furthermore, both experimental and computational investigations reveal that the excellent stability originates from the hydrophobic property of alkyl groups in C6H10N22+ cations. All of these results not only provide an efficient avenue to acquire 3D perovskitoid bulk single crystals but also inspire further exploration of ultrastable photoelectric devices.
研究领域:
材料科学
·
光电子学
·
钙钛矿材料
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半导体物理
·
晶体生长
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Xinyuan Bi,Yuqing Gu,Jian Ye
Single-molecule (SM) detection in surface-enhanced Raman spectroscopy (SERS) demonstrates ultrahigh sensitivity and boosts wide applications. The bianalyte SERS (BiASERS) technique largely improves the accuracy and reliability of SM SERS detection over the monoanalyte approach by avoiding the use of ultralow-concentration samples and induced inaccuracy and very limited events. Herein, dual-type single-nanoparticle (SNP) SERS detection, an adapted version of the bianalyte SM technique, was developed for the first time with two types of ultrabright gap-enhanced resonance Raman tags (GERRTs) with embedded near-infrared resonant fluorescent molecules, showing concentration- and acquisition time-dependent behaviors and the SNP sensitivity in both aqueous and dry states. Additionally, a correlative Raman imaging and scanning electron (RISE) microscopy confirms the SNP events of GERRTs on the substrate. Therefore, we expand the feasible application scenarios of the BiASERS technique from merely SM to SNP detection and more importantly demonstrate the effectiveness of the pure statistical model of BiASERS with the undoubted experimental examinations. Dual-type SNP detection of GERRTs may open new opportunities for development of ultrasensitive nanotags for reliable localized and quantitative detection in biological environments.
研究领域:
纳米生物学
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生物医学工程
·
光谱学
✓ 已验证
产品关联
DOI
ACS Nano
·
2019
·
IF 13.903
Mingxing Zhao,Wei Xia,Yang Wang,Man Luo,Zhen Tian,Yanfeng Guo,Weida Hu,Jiamin Xue
Two-dimensional (2D) materials with narrow band gaps (∼0.3 eV) are of great importance for realizing ambipolar transistors and mid-infrared (MIR) detections. However, most of the 2D materials studied to date have band gaps that are too large. A few of the materials with suitable band gaps are not stable under ambient conditions. In this study, the layered Nb2SiTe4 is shown to be a stable 2D material with a band gap of 0.39 eV. Field-effect transistors based on few-layer Nb2SiTe4 show ambipolar transport with a similar magnitude of electron and hole current and a high charge-carrier mobility of ∼100 cm2 V–1 s–1 at room temperature. Optoelectronic measurements of the devices show clear response to an MIR wavelength of 3.1 μm with a high responsivity of ∼0.66 AW–1. These results establish Nb2SiTe4 as a good candidate for ambipolar devices and MIR detection.
研究领域:
材料科学
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电子工程
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiao-Lin Wang,Yantao Chen,Yingli Chu,Wen-Jun Liu,David Wei Zhang,Shi-Jin Ding,Xiaohan Wu
Spectrum reconstruction with filter-free microspectrometers has attracted much attention owing to their promising potential in in situ analysis systems, on-chip spectroscopy characterizations, hyperspectral imaging, etc. Further efforts in this field can be devoted to improving the performance of microspectrometers by employing high-performance photosensitive materials and optimizing the reconstruction algorithms. In this work, we demonstrate spectrum reconstruction with a set of photodetectors based on graded-band-gap perovskite quantum dot (PQD) heterojunctions using both calculation and machine learning algorithms. The photodetectors exhibit good photosensitivities with nonlinear current–voltage curves, and the devices with different PQD band gaps show various spectral responsivities with different cutoff wavelength edges covering the entire visible range. Reconstruction performances of monochromatic spectra with the set of PQD photodetectors using two different algorithms are compared, and the machine learning method achieves relatively better accuracy. Moreover, the nonlinear current–voltage variation of the photodetectors can provide increased data diversity without redundancy, thus further improving the accuracy of the reconstructed spectra for the machine learning algorithm. A spectral resolution of 10 nm and reconstruction of multipeak spectra are also demonstrated with the filter-free photodetectors. Therefore, this study provides PQD photodetectors with the corresponding optimized algorithms for emerging flexible microspectrometer systems.
研究领域:
光学
·
材料科学
·
人工智能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Huanyong Li,Zhi Gu,Haiyang Zhang,Heqing Li,Li Fu
Three ZnE (E = Se, Te) single crystals were successfully grown directly from Zn-E (E = Se, Te) system with the assistance of I 2 or NH 4 Cl as the transport agents via a modified chemical vapor transport (CVT) method by avoiding the kinetics limitations of the congruent sublimation of ZnE compound. As-grown ZnE crystals exhibit different crystalline appearance due to various growth conditions. The structure, growth habit and morphologies of as-grown ZnE crystals are investigated by XRD , RO-XRD, SEM and optic microscope. ZnE crystals with NH 4 Cl transport agent look like the platelets with an interesting growth habit, while ZnE crystal with I 2 transport agent has high crystalline quality with a conical shape. Contrasting investigation between different growth results offers us an opportunity to understand the vapor-free-growth mechanism of ZnE crystals in closed-space CVT system, indicating that the free-growth habit of ZnE crystals depends on the growth parameters, which can be essentially attributed to their growth mechanism and the main vapor–solid reactions on the interfaces.
研究领域:
材料科学
·
晶体生长
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 41
·10785-10793
·
IF 5.256
Lei Han,Shi Gang Liu,Jiang Xue Dong,Jia Yu Liang,Ling Jie Li,Nian Bing Li,Hong Qun Luo
The facile and effective synthesis of truly multicolor photoluminescent (PL) polymer carbon dots (PCDs) is still a considerable challenge. Here, a mild and facile synthetic method to prepare multicolor emissive PCDs by self-oxidation and autopolymerization using hydroquinone and ethylenediamine as precursors is reported. The resulting PCDs were separated via silica-gel column chromatography, which gave three types of PCDs emitting bright and stable yellow, green, and blue fluorescence. The three types of PCDs exhibited attractive features such as excellent solubility, excitation wavelength-independent photoluminescence, high stability, monoexponential fluorescence lifetimes, and homogeneous optical properties. The uniform optical properties of the as-prepared PCDs helped us to explore their multicolor emissive PL mechanism. Detailed characterization and investigation of the PCDs revealed that their surface state was primarily responsible for the observed multicolor emissive photoluminescence. A PL mechanism that involved control of the energy gap by the surface state was proposed to explain the effect of the surface functional groups on the PL properties of the PCDs. The emission of the PCDs was strongly associated with the CN functional groups on their surface. The band gap narrowed with increasing content of CN on the PCD surface, resulting in the red shift of the PL emission peak.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Kangyan Yi,Yi Yu,Shiyi Tan,Jinzheng Zhang,Tingyan Ye,Nannan Liu,Xingxing Tang,Lijie Zhang,Shaoming Huang
Infectious diseases, genetic diseases, and malignant tumor diseases are all related to DNA, but simple, unlabeled, and sensitive devices to detect DNA remain challenging. Carbon nanotubes biosensor has the advantages of low cost, fast detection speed, small size, and good biocompatibility. A new strategy gap device for DNA detection by using gold nanorods assembled in single-walled carbon nanotubes ( [email protected] ) was developed. The AuNRs are synthesized with an average diameter of 56 ± 4.8 nm and a length of 95 ± 9.4 nm. Because of the anisotropic physical interaction between AuNRs and SWCNTs structure, when the SWCNTs grow on the surface of SiO 2 /Si substrate, the AuNRs are self-assembled orderly. The detection principle is based on the target DNA desorbing the probe DNA on the AuNRs to change its catalytic activity. The AuNRs are connected into nanowires along with the growth of the SWCNTs, thereby generating a conductance response. By adjusting the electrode gap, different detection limits were obtained. The 0.25 μm electrode gap device detected target DNA with the detection limit of 1 pM.
研究领域:
生物传感器
·
纳米技术
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Ning Liu,Rumin Li,Jiahui Zhu,Qi Liu,Rongrong Chen,Jing Yu,Ying Li,Hongsen Zhang,Jun Wang
In the present research, ZnS/WO 3 composites were prepared by coprecipitation method to construct the Z-scheme heterojunction photocatalyst with high efficiency electron separation for the photocatalytic reduction of U(VI). Compared with WO 3 and ZnS, the visible light absorption, photoreduction ability and photocatalytic activity of ZnS/WO 3 composites were improved. The ZnS/WO 3 composites show higher photoreduction U(VI) performance under visible light irradiation with the maximum extraction capacity of U(VI) at 1.52 g g −1 . The ZnS/WO 3 composites exhibit high uranium reduction ability under natural light with removal efficiency reaching 93.4 %. In-situ monitoring experiments and DFT calculations were designed to explore the mechanism and pathway of photoelectron transfer in the reduction process from U(VI) to U(IV). The results show that ZnS/WO 3 has an internal electric field to form a Z-scheme electron transfer , and uranium reduction is a dual-electron transfer pathway. In addition, the band gap regulation mechanism of binary composite semiconductor materials is deeply discussed.
研究领域:
材料科学
·
环境科学
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Plasmonics
·
2022
·Vol. 18
·期 1
·283-289
·
IF 2.726
Zhao Zhi-Rui,Zhang Shuo,Jing Rui-Ping,Kang Hao-Sen,Ding Si-Jing,Ma Liang
For noble metal core–shell nanomaterials with gaps, inserting Raman reporter molecules into the gaps allows for great Raman enhancement and has found promising applications in molecular analysis, bioimaging, and other fields. Herein, we synthesized Au/AgAu core–shell nanostructures with rhodamine B molecules encapsulated in the nanogap. Au/AgAu heterostructures have magnetic plasmon resonance by selecting gold nanocups as the substrate and tunable gap width by adjusting the molar ratio between Au and Ag during growing the shell. The strong and adjustable plasmon coupling between the core and the shell results in prominent electromagnetic field enhancement. Under the synergistic effect of electromagnetic plasmon resonance and plasmon coupling, the Au/AgAu heterostructures show excellent surface Raman scattering signal. Au/AgAu core–shell nanostructures with ~ 3.2 nm nanogap width display the highest Raman intensity. As the gap width is further reduced, the Raman signal gradually decreases, which may be due to the fact that the thicker alloy shell weakens the light penetration and scattering. Our findings can provide the inspiration for synthesize gap-enhanced Raman tags based on magnetic plasmon coupling.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）