- 标题
- 摘要
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- 实验方案
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A Water-soluble, NIR-absorbing Quaterrylenediimide Chromophore for Photoacoustic Imaging and Efficient Photothermal Cancer Therapy
摘要： Precision phototheranostics, including photoacoustic imaging and photothermal therapy, requires stable photothermal agents. Developing photothermal agents with high stability and high photothermal conversion efficiency (PTCE) remains a considerable challenge in biomedical applications. Herein, we introduce a new photothermal agent based on water-soluble quaterrylenediimide (QDI) that can self-assemble into nanoparticles (QDI-NPs) in aqueous solution. Incorporation of polyethylene glycol (PEG) into the QDI core significantly enhances both physiological stability and biocompatibility of QDI-NPs. These highly photostable QDI-NPs exhibit exciting advantages including intense absorption in the near-infrared (NIR) and high PTCE of up to 64.7 ± 4%. This is higher than that of many other organic photothermal agents, such as graphene or commercial indocyanine green (ICG). Their small size of approximately 10 nm enables a sustained retention in deep tumor sites and at the same time proper clearance from the body. QDI-NPs allow high-resolution photoacoustic imaging and efficient 808 nm laser-triggered photothermal therapy of cancer in vivo. The current study opens a promising way for precision phototheranostics.
关键词： quaterrylenediimide,photoacoustic imaging,NIR-absorption,pharmacokinetics,photothermal conversion efficiency
更新于2025-09-09 09:28:46
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A Water-soluble, NIR-absorbing Quaterrylenediimide Chromophore for Photoacoustic Imaging and Efficient Photothermal Cancer Therapy
摘要： Precision phototheranostics, including photoacoustic imaging and photothermal therapy, requires stable photothermal agents. Developing photothermal agents with high stability and high photothermal conversion efficiency (PTCE) remains a considerable challenge in biomedical applications. Herein, we introduce a new photothermal agent based on water-soluble quaterrylenediimide (QDI) that can self-assemble into nanoparticles (QDI-NPs) in aqueous solution. Incorporation of polyethylene glycol (PEG) into the QDI core significantly enhances both physiological stability and biocompatibility of QDI-NPs. These highly photostable QDI-NPs exhibit exciting advantages including intense absorption in the near-infrared (NIR) and high PTCE of up to 64.7 ± 4%. This is higher than that of many other organic photothermal agents, such as graphene or commercial indocyanine green (ICG). Their small size of approximately 10 nm enables a sustained retention in deep tumor sites and at the same time proper clearance from the body. QDI-NPs allow high-resolution photoacoustic imaging and efficient 808 nm laser-triggered photothermal therapy of cancer in vivo. The current study opens a promising way for precision phototheranostics.
关键词： quaterrylenediimide,photoacoustic imaging,NIR-absorption,pharmacokinetics,photothermal conversion efficiency
更新于2025-09-09 09:28:46
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Dimensionality engineering of hybrid halide perovskite light absorbers
摘要： Hybrid halide perovskite solar cells were first demonstrated in 2009 with cell efficiency quickly soaring from below 10% to more than 23% in a few years. Halide perovskites have the desirable processing simplicity but are very fragile when exposed to water and heat. This fragility represents a great challenge for the achievement of their full practical potential in photovoltaic technologies. To address this problem, here we review the recent development of the mixed-dimensional perovskites, whereby the trade-off between power conversion efficiency and stability of the material can be finely tuned using organic amine cations with different sizes and functionalities.
关键词： hybrid halide perovskite,organic amine cations,stability,mixed-dimensional perovskites,solar cells,power conversion efficiency
更新于2025-09-09 09:28:46
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Prospects of Impact Avalanche Transit-Time Diode Based on Chemical-Vapor-Deposited Diamond Substrate
摘要： We propose a chemical-vapor-deposited (CVD) diamond-based double-drift-region (DDR) impact avalanche transit-time diode (IMPATT) for use in microwave applications. CVD diamond is taken as the base substrate material. Simulations were carried out to perform direct-current (DC), small-signal, and noise analyses on the IMPATT. The results are in agreement with experimental reports. The IMPATT based on CVD diamond offers better performance compared with other materials reported to date at 26 GHz to 40 GHz. In the near future, this device could represent the best alternative for designers and semiconductor industry, due to its numerous advantages including higher DC-to-radiofrequency (RF) conversion efficiency (27.81%), highest power density (6.206 9 109 W m?2), minimum noise measure value (?98.22 dBm), and best optimized conductance–susceptance profile with lower quality factor (0.0215).
关键词： conversion efficiency,power density,impact ionization,DDR IMPATT,CVD diamond,noise measure
更新于2025-09-04 15:30:14
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High-performance GaAs nanowire cathode for photon-enhanced thermionic emission solar converters
摘要： GaAs nanowire cathodes with exponential doping and graded Al composition structures are proposed for photon-enhanced thermionic emission (PETE) devices. The conversion ef?ciency models with these two nanowire cathodes are deduced on the basis of one-dimensional continuity equations. The conversion ef?ciency as a function of wire length, wire width, Al composition distribution, cathode temperature, emissive surface and back interface recombination velocity are also simulated, respectively. Results show that exponential doping and graded Al composition cathode structures can obviously improve the conversion ef?ciency of devices through introducing a built-in electric ?eld along the growth direction of nanowire. Besides, the optimum wire length and wire width range are 300–340 nm and 5.9–6.4 lm, respectively. Moreover, wider Al composition range is bene?cial to achieve higher conversion ef?ciency. These simulations provide an interesting attempt to explore the working mechanism of GaAs nano-based PETE devices and are expected to be veri?ed by the experimental results in the future.
关键词： exponential doping,graded Al composition,photon-enhanced thermionic emission,GaAs nanowire,conversion efficiency
更新于2025-09-04 15:30:14
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Ag?Au‐Bimetal Incorporated ZnO‐Nanorods Photo‐Anodes for Efficient Photoelectrochemical Splitting of Water
摘要： Plasmonic Ag(cid:0) Au/ZnO nanorods (ZNRs) based photo-anodes were synthesized using a simple electrochemical route and were then evaluated for photoelectrochemical (PEC) activity. The amalgamation of Ag and Au nanoclusters broadens the UV-Vis light absorption in the range of 400 nm to 650 nm. Ag(cid:0) Au/ZNRs photo-anodes had shown photo-current density of ~ 1.4 mA cm(cid:0) 2, at a bias of 0.75 V/SCE, which is ~ 3.1 times of bare ZNRs photo-anode. Bi-metallic Ag(cid:0) Au/ZNRs based photo-anode shows the maximum photo-conversion efficiency of 0.77 % at 0.5 V/SCE, under one sun illumination. Formation of hot electrons in Ag(cid:0) Au/ ZNRs photo-anodes can be partly held responsible for the enhanced PEC activity. Au/Ag core/shell morphology evolves when a thin layer of Ag is loaded on Au nanoparticles. For an in-depth analysis on Ag(cid:0) Au incorporated ZNRs based photo-anodes and its PEC activity, a detailed characterization was carried out using physico-chemical, spectral and microscopy techniques. The analysis shows that Au in direct contact with ZnO interacts mainly with oxygen vacancies present on surface of ZnO and Ag interacts with Au for an effective electron-hole segregation process at interface and electron storage occurs in metal nanoparticles. The results suggest bi-metal incorporated ZNRs based photo-anodes can be a prospective candidate for PEC water splitting application.
关键词： Water splitting,Incident photon to current conversion efficiency (IPCE),Bi-metal photo-anodes,Electrodeposition,PEC activity
更新于2025-09-04 15:30:14
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A porous Ni-O/Ni/Si photoanode for stable and efficient photoelectrochemical water splitting
摘要： Excellent photoelectrochemical activity was demonstrated for an easily prepared porous Ni-O/Ni/Si photoanode with an onset potential of 0.93 VRHE, a photocurrent of 39.7 mA cm?2 at 1.23 VRHE, an energy conversion efficiency of 3.2% and a stability above 100 h.
关键词： stability,water splitting,porous Ni-O/Ni/Si photoanode,energy conversion efficiency,photoelectrochemical
更新于2025-09-04 15:30:14