查找使用阿拉丁产品的科研文献

Design and characterization of a compact photoionization toroidal ion trap mass spectrometer with MCP detection

Weijie Luo,Mutong Wu,Xuan Zhao,Zhongshan Zhang,Haifang Yang,Hua Cai,Quan Yu

A miniature photoionization toroidal ion trap (TorIT) mass spectrometer prototype was developed for the analysis of volatile organic compounds (VOCs) in ambient air. The TorIT analyzer features a simplified configuration comprising two planar and two ring electrodes, enabling efficient ion trapping and mass analysis in a compact structure. A microchannel plate (MCP) detector was strategically used to capture ions radially ejected from the trap, with its geometry well-matched to the TorIT design. These two modules were integrated into a compact assembly with an overall length of 50 mm. The entire system exhibits excellent pressure tolerance, allowing for stable operation at elevated pressures up to 0.11 Pa. To address background noise from MCP operation under high pressure and UV scattering, we implemented a discontinuous ionization strategy coupled with optimized signal filtering, significantly improving the quality of the ion peaks. During direct atmospheric sampling through a 75 μm capillary, the PI-TorIT instrument achieves sensitive VOC detection with a demonstrated limit of detection of 483 ppbv for anisole. The successful integration of the TorIT analyzer and MCP detector may present a viable approach for developing compact mass spectrometers.

Trap induction and regulation to enhance long persistent luminescence for information encryption and anti-counterfeiting

Teng Zhang,Ruchun Zhao,Heyi Yang,Fangyi Zhao,Qinan Mao,Meijiao Liu,Jiasong Zhong

The security level of traditional long persistent luminescence (LPL) phosphor with a single adjustable decay time is increasingly insufficient to meet the demands of a rapidly advancing society, resulting in significant losses for individuals and corporations. Therefore, exploring a phosphor with a two-model of adjustable decay time and afterglow color is meaningful for advanced information encryption and anti-counterfeiting. Here, we propose a simple and efficient strategy to regulate the trap type and concentration in high defect tolerance matrix CaGa 4 O 7 (CGO), achieving tunable emission color, afterglow color and decay time. At first, we introduce the rare earth ions Tb 3+ to generate the new defects, and then substitute Ca 2+ with Zn 2+ in CGO:Tb 3+ (CZGO:Tb 3+ ) phosphors to increase the inherent defects concentration, thereby greatly increasing the number of band electrons trapped by the defects and improving their LPL performance. Owing to the lattice distortion, its luminescence performance is increased by 6.09 times. It is worth noting that CZGO:Tb 3+ phosphor has a variety of emission modes over time, so it has great potential in information anti-counterfeiting and encryption applications.

Wide-Range Tuning of Trap Depths in Double Perovskite Phosphors Enabling Tunable NIR Persistent Luminescence

Rujun Yang,Kunjie Song,Yuantian Zheng,Chenhan Zhan,Yajing Wang,Cunjian Lin,Tianliang Zhou,Yixi Zhuang,Rong-Jun Xie

Persistent Luminescence (PersL) materials, which use traps to store energy and emit photons over a long period, have found important applications in the fields of optical information storage, security labeling, and biological imaging. The trap depth is a crucial factor determining the performance of these materials; however, achieving the desired trap depth with high precision remains a great challenge. Here, we provide double perovskite phosphors (Cs 2 SnCl 6 -Cs 2 ZrCl 6 -Cs 2 HfCl 6 series) with highly compatible crystal structures, enabling continuous and precise tuning of trap depth over an ultra-wide range of 0.11 to 1.25 eV. By incorporating W 4+ as the luminescent centers, these phosphors exhibit outstanding near-infrared (NIR) PersL performance at approximately 900 nm and a lasting emission duration exceeding 10 h. The underlying mechanism of PersL is elucidated, and the wide-range tunability of trap depth is attributed to the universal applicability of band-gap engineering in the entire material system. Furthermore, we demonstrate the practical application of these materials by designing a flexible detector plate for X-ray imaging. The detector plate exhibits a storage time of more than 1 week, a detection limit of 0.83 μGy air ·s -1 in the near-infrared region, and real-time and delay-time imaging resolutions of 14.2 lp·mm -1 and 2.5 lp·mm -1 , respectively. These attributes demonstrate strong potential for X-ray luminescence extension imaging.

Double Perovskite Scintillators Enabled by Co-Doped Trap Regulation for Thermally Enhanced X-Ray Imaging

Renyan Huang,Xiong Zhang,Xieming Xu,Yi Zheng,Xin Huang,Min Chen,Shuaihua Wang,Shaofan Wu

Scintillation materials play a significant role in the exploration of extreme space environments and high-energy physics. Nevertheless, due to the prevalence of thermal quenching, most traditional scintillators are not capable of stable X-ray imaging at high-temperature working mode. In this work, Ce 3+ and Tb 3+ ions are successfully co-doped into Cs 2 NaGdCl 6 double perovskites (DPs) via a solvothermal method, exhibiting unusual thermally enhanced scintillation performance. Specifically, the radioluminescence intensity of Cs 2 NaGdCl 6 :Tb 3+ /Ce 3+ increases with temperature to achieve a large intensity ratio of 3.67 from 80 to 500 K. Interestingly, the introduction of co-doped ions brings the dramatic increase of thermoluminescence intensity, demonstrating that an increased number of deep trap results in the suppression of the thermal quenching. At the same time, the extra occurrence of deep traps can be traced to localized octahedral distortions around the dopant ions. Moreover, a flexible DP-based scintillation film is fabricated by a direct coating method, showing thermally enhanced X-ray imaging. Ultra-stable X-ray imaging performance over 5 h is realized under a high temperature of 380 K by the scintillation film. The results provide a trap regulation strategy for exploring novel high-performance and stable scintillators at high temperatures.

Modulating trap properties by Cr3+-doping in Zn2SiO4: Mn2+ nano phosphor for optical information storage

Xin Yi,Hui Liu,Yihuan Wang,Junjie Chen,Zhanglin Chen,Yuzhen Wang,Xuanyi Yuan,Kaiming Zhu

Photo-stimulated luminescent materials are one of the most attractive alternatives for next-generation optical information storage technologies. However, there are still some challenges in regulating appropriate energy levels of traps in luminescent materials for optical information storage. Herein, a green emission nanophosphor Zn 2 SiO 4 : Mn 2+ , Cr 3+ with the trap depth of 1.05 eV, fulfilling the requirements for optical information storage, was fabricated for the first time through the solution combustion method and subsequent heat treatment at 1000 °C for 2 h. The crystal structure, micromorphology , photoluminescence (PL), photoluminescence excitation (PLE), and afterglow properties of Zn 2 SiO 4 : Mn 2+ , Cr 3+ were studied systematically. By applying the strategy of trap depth engineering, high trap density with proper trap depth was observed when Cr 3+ ions were introduced into Zn 2 SiO 4 : Mn 2+ . Thermoluminescence (TL) glow-curve analysis through the initial rise (IR) method was conducted to gain some insights into the information of traps. As proof of application, optical information storage was experimentally achieved by choosing 275 nm illumination for “information writing” and 980 nm NIR excitation for “information reading”. The results indicate that Zn 2 SiO 4 : Mn 2+ , Cr 3+ phosphor holds promise for potential applications in the field of optical information storage.

A trap-assisted ultrasensitive near-infrared organic photomultiple photodetector based on Y-type titanylphthalocyanine nanoparticles

Xiaolong Li,Shirong Wang,Yin Xiao,Xianggao Li

Based on Y-type titanylphthalocyanine nanoparticles (Y-TiOPc NPs) with an average diameter of 2.5 ± 0.6 nm, a trap-assisted ultrasensitive near-infrared organic photodetector (NIR OPD) has been successfully fabricated using the dip-coating process. The prepared OPD exhibited an obvious photomultiplication phenomenon with the highest external quantum efficiency (EQE) of 354 200%, an excellent photosensitivity with the maximum photoresponsivity (R) of 2227 A W−1, and an outstanding low-light detection with the highest normalized detectivity (D*) of 3.1 × 1014 Jones under 780 nm illumination with a low intensity of 0.1 μW cm−2 at +15 V μm−1. Such performances were attributed to the ultrasmall Y-YiOPc NPs with remarkable photosensitivity and a high surface-to-volume ratio which can enhance external hole tunneling injection assisted by trapped-electrons at the photoactive layer/ITO interface. The high EQE and R properties of the device, as well as the prompt, steady and reproducible photocurrent response during repeated on/off cycles of illumination, suggested that the prepared OPD was desired for ultrasensitive NIR detection. Therefore, the ultrasmall Y-TiOPc NPs proposed in this study showed great promising application in the large-area and low-cost solution process of ultrasensitive NIR OPDs.

A Spatially Stable Crystal-Particle Gel to Trap Patchouli Oil for Efficient Colonic Drug Delivery

Ru Guo,Weihua Xu,Yingshu Wang,Lixia Yue,Shaogang Huang,Yanfeng Xiu,Yongzhuo Huang,Bing Wang

Patchouli oil has exhibited remarkable efficacy in the treatment of colitis. However, its volatility and potential irritancy are often drawbacks when extensively used in clinical applications. Oil gel is a semisolid and thermoreversible system that has received extensive interest for its solubility enhancement, inhibition of bioactive component recrystallization, and the facilitation of controlled bioactive release. Therefore, we present a strategy to develop an oil gel formulation that addresses this multifaceted problem. Notably, a patchouli oil gel formulation was designed to solidify and trap patchouli oil into a spatially stable crystal-particle structure and colonic released delivery, which has an advantage of the stable structure and viscosity. The patchouli oil gel treatment of zebrafish with colitis improved goblet cells and decreased macrophages. Additionally, patchouli oil gel showed superior advantages for restoring the tissue barrier. Furthermore, our investigative efforts unveiled patchouli oil’s influence on TRP channels, providing evidence for its potential role in mechanisms of anti-inflammatory action. While the journey continues, these preliminary revelations provide a robust foundation for considering the adoption of patchouli oil gel as a pragmatic intervention for managing colitis.

An Electron and Hole Trap Energy Distribution Estimation Model and Its Application in Polypropylene Nanocomposites

Linzhen Fan,Guohui Hao,Wenjia Zhang,Youping Tu,Bingying Chen,Zhong Zheng,Shangshi Huang,Qi Li,Jinliang He

Stable Lead-Free Blue-Emitting Cs3Cu2Br5 Single Crystal with Self-Trap Exciton Emission for Optoelectronics

Xixi Zheng,Jinxin Huang,Yaoyu Liu,Tianyu Wang,Shiguo Han,Zongqi Wang,Bing Teng,Shaohua Ji

Owing to their excellent photoelectric properties, perovskite materials have broad application prospects; however, the toxicity of Pb limits the application of Pb-based perovskite materials. To overcome this problem, Pb-free perovskite materials are prepared by replacing Pb with nontoxic elements including Ge and Sn; nevertheless, the stabilities of these materials are low. Herein, single crystals of nontoxic Cu(I)-based ternary metal halide (Cs 3 Cu 2 Br 5 ) with outstanding stabilities and self-trapped excition (STE) emission are constructed by an antisolvent method for the first time; these crystals exhibit central blue emission at 458 nm and large Stokes shifts. Photoluminescence (PL) intensities of the single crystals remain above 96.9% of their initial intensities when these crystals are exposed to an atmospheric environment for 90 days. Moreover, the stabilities of the Cs 3 Cu 2 Br 5 single crystals are investigated by temperature-dependent PL spectroscopy, which suggests a considerable exciton binding energy of 503 meV, and derivative thermogravimetric analysis, which indicate that the temperature of complete decomposition of Cs 3 Cu 2 Br 5 is above 930 °C. Furthermore, a new class of white light-emitting diodes with an ultrahigh color rendering index of 97.8 and satisfactory performance is produced using the Cs 3 Cu 2 Br 5 single crystals. The study demonstrates significant potentials of Cu(I)-based single crystals in the field of optoelectronics.

3D printing deep-trap hierarchical architecture-based non-contact sensor for multi-direction motion monitoring

Binbin Wang,Meng Gao,Xiaofei Fu,Mengchen Geng,Yang Liu,Ningxuan Cheng,Jie Li,Lihong Li,Zhengjian Zhang,Yanlin Song

Non-contact sensors, intelligent electronics that interact with surrounding information with no physical contact, are highly desirable for human-machine interaction. Due to the increased sensing distance and expanded operation scope, it is anticipated the non-contact device exhibiting enhanced electrical output and detection range. Here, freeze-drying assisted 3D printing approach is employed to fabricate cellulose nanofiber (CNF)/MXene-based deep-trap hierarchical architecture for non-contact triboelectric nanogenerators, which exhibit excellent sensing performance for multi-direction motion monitoring. The intermolecular hydrogen bonding between CNF and MXene nanosheets facilitates the formation of a well-dispersed ink with suitable viscoelasticity for 3D printing. The incorporation of MXene nanosheets provides the printed scaffold with more open pores for increased charge generation. Meanwhile, the high electron trapping capability of MXene leads to a weakened electron escaping tendency and an increased decay time, which are beneficial for the device’s non-contact voltage output. Based on the as-prepared non-contact sensor, an all-printed sensing array and a 3D sensor are demonstrated for multi-site and multi-dimension motion trajectories monitoring, indicating its great potential in healthcare, safe navigation, and artificial intelligence.

Effect of Trap Regulation on Vacuum DC Surface Flashover Characteristics of Nano-ZnO/PI Film

Jiang Wu,Bo Zhang,Tianjiao Li,Yan Du,Wen Cao,Hao Yang

The operating safety of spacecraft in space environments is closely related to the surface discharging phenomenon of dielectrics such as polyimide (PI) film in solar arrays; moreover, carrier traps in the dielectric can affect its insulation performance. Therefore, to improve the vacuum surface flashover characteristics of PI film by nano modification and reveal the effect of trap distribution on the flashover of PI composite film, first, the original PI and nano-ZnO/PI composite films with different additive amounts (0.5, 1, 2, and 3 wt.%) were prepared by in situ polymerization and their performance was evaluated by the physicochemical properties characterized by methods such as thermogravimetric analysis; second, the surface traps of the original and nanocomposite films were measured and calculated by surface potential decay method, and the carrier mobility was also obtained; finally, the vacuum direct current (DC) surface flashover characteristics and bulk resistivity of all the film samples were measured and analyzed. The experiment results showed that with the increase in the amount of nano-ZnO, both the shallow and deep trap density increased significantly, while the trap energy varied slightly, and the surface flashover voltage also increased obviously. Based on the multi-core model, the increases in the shallow and deep trap density after the introduction of nano-ZnO into the PI matrix was analyzed from the microscopic perspective of the interface. Based on the comparative analysis of the trap distribution and surface flashover voltage characteristics, a bilayer model of vacuum DC surface flashover development was proposed. In the bilayer model, deep traps and shallow traps play a dominant role in the vacuum–solid interface and the inner surface of the dielectric, respectively, and increasing the trap density could effectively inhibit secondary electron multiplication on the surface and accelerate charge dissipation inside the film. Consequently, nano-ZnO can purposefully control the trap distribution, and then improve the flashover characteristics of nano-ZnO/PI composite films, which provides a new approach for improving the spacecraft material safety.Keywords:nanocomposite;polyimide film;trap distribution;DC surface flashover;bilayer model

Trap states engineering toward all-inorganic CsPbBr3 perovskite nanocrystals for highly efficient light-emitting diodes

Xudong Jin,Yanqin Miao,Jianhua Dong,Jingkun Wang,Qiqing Lu,Min Zhao,Bingshe Xu,Junjie Guo

The room-temperature triple-ligand surface engineering strategy demonstrates the advantages of low-cost and high-yield in the preparation of perovskite nanocrystals (PeNCs). However, conventional octanoic acid (OTAc) with short-chain length shows weak binding energy with Pb2+, resulting in higher trap states density and inferior stability of PeNCs. Here, we prepare CsPbBr3 PeNCs capped with 4-dodecylbenzene sulfonic acid (DBSA) to maintain lower trap states density, a higher photoluminescence quantum yield of 91%, larger yield production and better stability compared to OTAc-PeNCs. Consequently, DBSA-PeNCs based PeLEDs with a peak external quantum efficiency (EQE) of 8.95% and a maximum luminance of 4452 cd m−2 are achieved, which constitute about 3-fold and 2-fold enhancement compared to OTAc-PeNCs based PeLEDs, respectively. These results demonstrate that introducing DBSA as the surface ligand is an effective way to realize highly efficient PeLEDs.