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{Zn <sub/>6</sub> } Cluster Based Metal–Organic Framework with Enhanced Room-Temperature Phosphorescence and Optoelectronic Performances
摘要： Molecule-based solid-state materials with long lifetimes could enable longer migration distances for excitons, which are beneficial for vast applications in optoelectronic field. Herein, we report a hexanuclear zinc cluster based MOF exhibits highly enhanced phosphorescence about 2 orders of magnitude in comparison with the pristine phosphor ligand. The combination of both experimental and computational results suggest that the {Zn6} cluster is very important for adjusting molecular conformations, packing arrangement, and photophysical properties of the organic phosphor ligands within the MOF matrix. Optoelectronic measurements reveal that the MOF-modified electrode is catalytically active to hydrogen evolution under light irradiation in neutral solution. Thus, our study provide an effective way to achieve low-cost metal-based phosphorescence MOF, expanding its further optoelectronic applications.
关键词： optoelectronic performances,metal?organic framework,hexanuclear zinc cluster,room-temperature phosphorescence
更新于2025-11-14 15:23:50
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Preparation of DNA functional phosphorescent quantum dots and application in melamine detection in milk
摘要： Bio-functionalization of quantum dots (QDs) is of important value in practical applications. With single-stranded DNA (ssDNA) rich in thymine T and thioguanine G taken as the template, a new-type nanocomposite material (ssDNA-PQDs) synthesized from low-toxicity T-ssDNA functionalized Mn–ZnS and room-temperature phosphorescent (RTP) QDs (PQDs) was prepared in this paper by optimizing synthesis conditions, and these ssDNA-PQDs could emit orange RTP signals at 590 nm. As these ssDNA-PQDs are rich in T sequences and T sequences can bond with melamine through the hydrogen-bond interaction, ssDNA-PQDs experience aggregation, thus causing phosphorescent exciton energy transfer (PEET) between ssDNA-PQDs of di?erent particle sizes and their RTP quenching. Based on this principle, an RTP detection method for melamine was established. The linear range and detection limit of the detection method are 0.005–6 mM and 0.0016 mM respectively. As this method is based on the RTP nature of ssDNA-PQDs, it can avoid disturbance from background ?uorescence and scattered light of the biological ?uid, and it is very suitable for melamine detection in the biological ?uid milk.
关键词： DNA functionalized quantum dots,milk safety,melamine detection,room-temperature phosphorescent
更新于2025-11-14 15:23:50
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Flexible and stable organic field-effect transistors using low-temperature solution-processed polyimide gate dielectrics
摘要： Polyimide (PI) has been widely used as a gate dielectric due to its remarkable thermal stability, chemical resistance, and mechanical flexibility. However, the high processing temperature and high surface energy of PI gate dielectrics hinder the realization of flexible and reliable electronic applications with low-cost manufacturing. Here, a low-temperature solution-processed organic field-effect transistor (OFET) is successfully demonstrated using a fully imidized soluble PI gate dielectric. The low temperature processability of soluble PI gate dielectrics is confirmed by investigating the effect of annealing temperature on the dielectric properties and electrical characteristics. By blending 6,13-Bis(triisopropylsilylethynyl)pentacene with polystyrene, the reliability of OFET is considerably enhanced while maintaining high device performance. As a result, OFETs exhibit excellent flexibility and can be integrated with ultrathin parylene substrates without degrading device performance. This work presents the steps to develop flexible and reliable electronic applications with low-cost manufacturing.
关键词： organic field-effect transistors,solution-processed,polyimides,low-temperature,operational stability
更新于2025-11-14 15:19:41
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Templated direct growth of ultra-thin double-walled carbon nanotubes
摘要： Double-walled carbon nanotubes (DWCNTs) combined the advantages of multi-walled (MW-) and single-walled (SW-) CNTs can be obtained by transforming the precursors (e.g. fullerene, ferrocene) into thin inner CNTs inside SWCNTs as templates. However, this method is limited since the DWCNT yield is strongly influenced by the filling efficiency (depending on the type of the filled molecules), opening and cutting the SWCNTs, and the diameter of the host SWCNTs. Therefore, it cannot be applied to all types of SWCNT templates. Here we show a universal route to synthesize ultra-thin DWCNTs via making SWCNTs stable at high temperature in vacuum. This method applies to different types of SWCNTs including metallicity-sorted ones without using any precursors since the carbon sources were from the reconstructed SWCNTs and the residue carbons. The resulting DWCNTs are with high quality and the yield of inner tubes is comparable to/higher than that of the DWCNTs made from the transformation of ferrocene/fullerene peapods.
关键词： Double-walled carbon nanotubes,ultra-thin,high-temperature annealing,DWCNTs,SWCNTs
更新于2025-11-14 15:16:37
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Reactive Mechanism of Cu2ZnSnSe4 Thin Films Prepared by Reactive Annealing of the Cu/Zn Metal Layer in a SnSex + Se Atmosphere
摘要： Cu2ZnSnSe4 (CZTSe) thin films were prepared by a two-step process with the electrodeposition of a Cu/Zn metallic stack precursor followed by a reactive anneal under a Se + Sn containing atmosphere. We investigate the effect of the Sex and SnSex (x = 1,2) partial pressures and annealing temperature on the morphological, structural, and elemental distribution of the CZTSe thin films. Line scanning energy dispersive spectroscopy (EDS) measurements show the presence of a Zn-rich secondary phase at the back-absorber region of the CZTSe thin films processed with higher SnSex partial pressure and lower annealing temperatures. The Zn-rich phase can be reduced by lowering the SnSex partial pressure and by increasing the annealing temperature. A very thin MoSe2 film between the CZTSe and Mo interface is confirmed by X-ray diffraction (XRD) and grazing incidence X-ray diffraction (GIXRD) measurements. These measurements indicate a strong dependence of these process variations in secondary phase formation and accumulation. A possible reaction mechanism of CZTSe thin films was presented. In a preliminary optimization of both the SnSex partial pressure and the reactive annealing process, a solar cell with 7.26% efficiency has been fabricated.
关键词： Sex and SnSex (x = 1,2) partial pressures,annealing temperature,metallic stack precursor,Cu2ZnSnSe4 (CZTSe),electrodeposition
更新于2025-11-14 15:15:56
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Metamaterial emitter for thermophotovoltaics stable up to 1400?°C
摘要： High temperature stable selective emitters can significantly increase efficiency and radiative power in thermophotovoltaic (TPV) systems. However, optical properties of structured emitters reported so far degrade at temperatures approaching 1200 °C due to various degradation mechanisms. We have realized a 1D structured emitter based on a sputtered W-HfO2 layered metamaterial and demonstrated desired band edge spectral properties at 1400 °C. To the best of our knowledge the temperature of 1400 °C is the highest reported for a structured emitter, so far. The spatial confinement and absence of edges stabilizes the W-HfO2 multilayer system to temperatures unprecedented for other nanoscaled W-structures. Only when this confinement is broken W starts to show the well-known self-diffusion behavior transforming to spherical shaped W-islands. We further show that the oxidation of W by atmospheric oxygen could be prevented by reducing the vacuum pressure below 10?5 mbar. When oxidation is mitigated we observe that the 20 nm spatially confined W films survive temperatures up to 1400 °C. The demonstrated thermal stability is limited by grain growth in HfO2, which leads to a rupture of the W-layers, thus, to a degradation of the multilayer system at 1450 °C.
关键词： W-HfO2 layered structure,selective emitters,metamaterial emitter,high temperature stability,thermophotovoltaics
更新于2025-10-22 19:40:53
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AIP Conference Proceedings [Author(s) THE 3RD INTERNATIONAL CONFERENCE ON OPTOELECTRONIC AND NANO MATERIALS FOR ADVANCED TECHNOLOGY (icONMAT 2019) - Kerala, India (3–5 January 2019)] - Effect of substrate temperature on spray coated PEDOT:PSS thin film morphology for organic solar cell
摘要： The effect of substrate temperature on the spray coated poly (3,4-ethylenedioxythiophene): poly (styrenesulfonic acid) (PEDOT: PSS) hole transport layer (HTL) is explored in terms of morphological, electrical and photovoltaic characterization. The substrate temperature is varied in three steps 100, 150 and 200°C during the spray deposition of PEDOT: PSS thin film layer. Scanning electron microscopy (SEM) and optical microscopy images reveal that for the substrate temperatures of 100°C and 150°C, the morphology of PEDOT: PSS layer is improved and further increasing the temperature to 200°C, voids and cracks are formed in the films. These voids and cracks influence the conductivity of PEDOT: PSS layer which reduces from 4.7 for 150°C to 3.9 S/cm for 200°C. Organic solar cells (OSCs) using PTB7:PC71BM absorber layer on the spray coated PEDOT:PSS HTL show an efficiency increase from 2.34 for 100°C to 2.88% for 150°C and then decrease to 1.88% for 200°C.
关键词： substrate temperature,spray coating,PEDOT:PSS,morphology,organic solar cells
更新于2025-10-22 19:40:53
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[ASME ASME 2018 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems - San Francisco, California, USA (Monday 27 August 2018)] ASME 2018 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems - Next Gen Test-Vehicle to Simulate Thermal Load for IoT FPGA Applications
摘要： As semiconductor device feature size scales and circuit performance increases, power dissipation and thermal management are becoming very important. Attention to thermal considerations is required throughout the chip development cycle from preliminary architecture planning to deployment on customer board and beyond. This paper describes a versatile thermal test vehicle that can be used to address these requirements. We discuss the architecture and implementation of a specially designed test-vehicle chip, followed by its operation. The programmability and flexibility of this vehicle will be highlighted. In addition, we cover other usage of this vehicle which includes modelling of chip-level thermal behavior with different floorplan, simulating thermal loads in IoT FPGA applications, cross-calibrating thermal numerical simulators with measured silicon data and evaluating the thermal impact of different package form-factor / material (such as thermal interface material) and cooling solutions. The abovementioned chip was fabricated using 0.18um technology and assembled in a flip-chip package. The reminder of this evaluation system is a simple, inexpensive tester from which a software is run to program the chip and to measure the spatial & temporal temperature values. Measured thermal data from different use cases are presented in this paper.
关键词： on-chip temperature measurement,thermal management,package development,package-level thermal evaluation,on-die heating,IoT servers,on-die temperature sensing,characterization methodology,thermal evaluation tool
更新于2025-09-23 15:23:52
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Analysis of Thermal and Optical Characteristics of Light Emitting Diode on Various Heatsinks
摘要： Light emitting diodes (LED) are widely used in today’s world due to its less power consumption and its high luminance capacity. Around 20-30% of energy is converted to light energy and 70-80% of energy is dissipated as heat. The excessive rise in temperature causes failure to the LED. An effective thermal management is required for the proper heat dissipation in LED. In this work, the heat dissipation and the optical characteristics of the 16 W LED are studied using different types of aluminium heat sinks. The variation of case and junction temperature as well as the optical characteristic of LED is measured for different heatsink at different It was observed that heat sink with higher surface area shows the best result in terms of lower case and junction temperature. The higher luminous intensity was observed for the parallel fin type 1 heatsink due to higher surface area.
关键词： Heatsink,Case temperature,Light Emitting Diode (LED),Junction temperature
更新于2025-09-23 15:23:52
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Low-Temperature Graphene Growth by Forced Convection of Plasma-Excited Radicals
摘要： We developed the forced convection (FC)-PECVD method for the synthesis of graphene in which a specially designed blowing plasma source is used at moderate gas pressure (1-10 Torr) and the distribution of reactive radicals reaching the substrate surface can be controlled by forced convection. Self-limiting growth of graphene occurs on copper foil and monolayer graphene growth with few defects is achieved even at low temperature (<400 °C). We also demonstrated the enlargement of growth area using the scalable blowing plasma source. We expect that the FC-PECVD method overcomes the limitations of conventional low-temperature PECVD and provides a breakthrough for the achievement of industrial applications based on graphene.
关键词： low temperature growth,self-limiting growth,Graphene,forced-convection plasma CVD
更新于2025-09-23 15:23:52