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Silver doping induced luminescence enhancement and red shift of gold nanoclusters with aggregation-induced emission
摘要： Deep understanding on the luminescence property of aggregation-induced emission (AIE) featured metal nanoclusters (NCs) is highly desired. This paper reports an systematic study on enhancing the luminescence of AIE-featured Au NCs, which is achieved by Ag doping to engineer the size/structure and aggregation states of the Au(I)-thiolate motifs in the NC shell. Moreover, by prolonging reaction time, the luminescence of the as-synthesized AuAg NCs could be further tailored from orange to red, which is also due to the variation of the Au(I)-thiolate motifs of NCs. This study can facilitate the better understanding of this AIE-featured luminescent probe and the design of other synthetic routes for this rising family of functional materials.
关键词： bimetallic,aggregation-induced emission,luminescence enhancement,nanoclusters,red shift
更新于2025-09-10 09:29:36
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Highly efficient optical aggregation network with network functions virtualization
摘要： Network functions virtualization enables network edge functions to be relocated from dedicated hardware to distributed pools of commodity servers. Metro aggregation networks provide transport between access gateway nodes and such servers accommodating virtual network functions (VNFs). Networks need to be designed to increase the efficiency of network resource usage and reducing network cost as well as energy consumption. However, independently placing VNFs on a server from a physical network design degrades the efficiency of resource usage and causes an increase in network cost. We can avoid such problems by adequately placing each VNF in consideration of the location of access gateway nodes and a network topology. We thus propose a method for designing an optical aggregation network with VNF placement. We successfully formulate the design method as mixed-integer linear programming and demonstrate its effectiveness through intensive mathematical experiments. The experiments showed that the proposed method reduced network cost by up to about 18% while performing almost optimally in terms of server load dispersion.
关键词： virtual network function,mixed-integer linear programming,network functions virtualization,server load dispersion,optical aggregation network
更新于2025-09-10 09:29:36
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Effect of substituents on photophysical and aggregation behaviour in quinoline based bis-terpyridine Zn(II) complexes
摘要： Synthesis of the terpyridine based novel Zn(II) complexes (C1-C3) have been described. Characterization of these complexes has been achieved by spectroscopic studies (IR, 1H, 13C, 19F, HRMS, UV/Vis and fluorescence) and structure of C1 determined by X-ray single crystal analyses. Cautious tuning by incorporating appropriate substituents (–H; C1, –CH3; C2 and –OCH3; C3) enabled the complexes to exhibit solvent dependent emission indicative of more polarized excited state probably due to enhanced intramolecular charge transfer (ICT). Occurrence of aggregation induced emission (AIE) in C3 has been validated by solid state emission and vital role of RIR in inducing AIE upon aggregation by fluorescence lifetime experiments. The role of solvent and substituents on photophysical behaviour and morphology of the complexes has been investigated by UV/Vis, emission and scanning electron microscopy (SEM). As well, lowering of the energy gap between HOMO and LUMO by electron donating substituents –CH3 (C2) and –OCH3 (C3) has been supported by DFT studies.
关键词： Zn(II) complexes,photophysical properties,DFT studies,aggregation induced emission,terpyridine
更新于2025-09-10 09:29:36
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Aggregation-induced emission (AIE) fluorophores as imaging tools to trace the biological fate of nano-based drug delivery systems
摘要： The vigorous development of nanotechnology has been accompanied by an equally strong interest and research efforts in nano-based drug delivery systems (NDDSs). However, only a few NDDSs have been translated into clinic thus far. One of the important hurdles is the lack of tools to comprehensively and directly trace the biological fate of NDDSs. Recently, aggregation-induced emission (AIE) fluorophores have emerged as attractive bioimaging tools due to flexible controllability, negligible toxicity and superior photostability. Herein, we recapitulate the current advances in the application of AIE fluorophores to monitor NDDSs both in vitro and in vivo. Particularly, we discuss the cellular fates of self- indicating and stimuli-responsive NDDSs with AIE fluorophores. Moreover, we highlight the in vivo application of AIE agents on the long-term tracking of therapeutics and the multi- modal monitoring of diagnostics in NDDSs. Challenges and opportunities in AIE-guided exploration of NDDSs are also discussed in detail.
关键词： aggregation-induced emission,bioimaging tools,nano-based drug delivery system,in vitro and in vivo
更新于2025-09-10 09:29:36
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Hydrogen gas sensing properties of WO3 sputter-deposited thin films enhanced by on-top deposited?CuO nanoclusters
摘要： Magnetron-based gas aggregation cluster source (GAS) was used to prepare high-purity CuO (cupric oxide) nanoclusters on top of sputter-deposited thin film of tungsten trioxide (WO3). The material was assembled as a conductometric hydrogen gas sensor and its response was tested and evaluated. It is demonstrated that addition of CuO clusters noticeably enhances the sensitivity of the pure WO3 thin film. With an increasing amount of CuO clusters the sensitivity of CuO/WO3 system rises further. When CuO clusters form a sufficiently thick and compact layer, the resistance response is reversed. Based on the sensorial behavior, conventional and near-ambient pressure X-Ray photoemission spectroscopies, and resistivity measurements, we propose that the sensing mechanism is based on the formation of nano-sized p-n junctions in between p-type CuO and n-type WO3. The advantages of the GAS technique for preparing sensorial and/or catalytically active materials are emphasized.
关键词： Hydrogen gas sensor,Gas aggregation cluster source,Magnetron sputtering,Tungsten oxide,Nanocomposites,Cupric oxide
更新于2025-09-10 09:29:36
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AIE-active luminogen for highly sensitive and selective detection of picric acid in water samples: Pyridyl as an effective recognition group
摘要： Detection of nitroaromatic explosives especially picric acid (PA) is considerably worth concern on human safety and homeland security. Herein, we developed an effective probe (APPTPEP) for PA detection in aqueous medium by combination of 1,4-dihydropyrrolo[3,2-b]pyrrole with tetraphenylethylene and pyridine units. The incorporation of tetraphenylethylene unit in the backbone endows the APPTPEP a significant aggregation induced emission (AIE) behavior. Pyridyl group was proved as recognition site for PA and their strong interaction was confirmed by 1H NMR titration and supported by theoretical calculation. Owing to this strong affinity, APPTPEP exhibited high selectivity and sensitivity (limit of detection 31.5 nM) to PA over other nitroaromatic compounds. This research provides new insights into the rational design of AIE-active materials for effective sensing application.
关键词： 1,4-dihydropyrrolo[3,2-b]pyrrole,Picric acid,Aggregation-induced emission,Pyridyl group
更新于2025-09-10 09:29:36
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Effective GQD/AuNPs nanosensors for selectively bifunctional detection of lysine and cysteine under different photophysical properties
摘要： This work presented the development of the optical nanosensor based on AuNPs and GQDs which perform the efficiency dual optical sensor. Importantly, the AuNPs with GQDs was prepared by one-pot chemical reaction by using GQDs as an excellent bifunction of the reducing agent and stabilizer to obtain the disaggregated AuNPs/GQDs in red color property. Apart from its photophysical sensing ability, this hybrid material demonstrated the dual sensing of cysteine and lysine regarding to colorimetric and fluorometric techniques, respectively, in PBS solution pH 7.4. The presence of Cys in the AuNPs/GQDs solution rapidly lead to the color change from red to blue with concomitant of the red shift of the absorption band at 525 to 645 nm undergone the aggregation process. On the other hand, AuNPs/GQDs nanosensor in the presence of Lys performs the off-on fluorescence at 450 nm without color change in PBS solution pH 7.4. Interestingly, no interference of any amino acids towards Cys and Lys detection highlighted a high efficacy in selective sensing aspect. For sensing application, the detection limit of Cys and Lys was 5.88 μM and 16.14 μM, respectively, with an acceptable % recovery of 101–106 in real samples.
关键词： Graphene quantum dot,Gold nanoparticles,Aggregation,Lysine,Cysteine,Displacement
更新于2025-09-10 09:29:36
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Deploying solar energy with community choice aggregation: A carbon fee model
摘要： This article investigates solar photovoltaic deployment through community choice aggregation programs. A case study of a solar energy program facilitated through a public energy council in Southeastern Ohio is highlighted, which used a ‘carbon fee’ model to collect a 0.2 cents per kilowatt hour incremental fee above the standard aggregation rate. This premium funds the development of behind-the-meter solar installations, and may serve as an exemplary approach for other aggregation programs to deploy solar.
关键词： solar energy,electricity,local governance,Ohio,Community choice aggregation
更新于2025-09-10 09:29:36
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Understanding the Role of Aggregation in the Broad Absorption Bands of Eumelanin
摘要： In this work, we investigate the relationship between the complex hierarchical assembly structure of eumelanin, its characteristic broad absorption band, and the highly unusual nonlinear dynamics revealed by pump-probe or transient absorption microscopy. Melanin-like nanoparticles (MelNPs), generated by spontaneous oxidation of dopamine, were created with uniform but adjustable size distributions, and kinetically controlled oxidation was probed with a wide range of characterization methods. This lets us explore the broad absorption bands of eumelanin models at different assembly levels, such as small subunit fractions (single monomeric and oligomeric units and small oligomer stacks), stacked oligomer fractions (protomolecules) and large-scale aggregates of protomolecules (parental particles). Both the absorption and pump-probe dynamics are very sensitive to these structural differences, or to the size of intact particles (a surprising result for an organic polymer). We show that the geometric packing order of protomolecules in long-range aggregation are key secondary interactions to extend the absorption band of eumelanin to the low energy spectrum, and produce drastic changes in the transient absorption spectrum.
关键词： broad absorption band,aggregation,geometric packing order,hierarchical assembly structure,Eumelanin
更新于2025-09-10 09:29:36
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Synthesis of luminescent gold nanoclusters embedded goose feathers for facile preparation of Au(I) complexes with aggregation-induced emission
摘要： A new kind of luminescent hybrid materials based on ultra-small nanomaterials, i.e., gold nanoclusters (AuNCs) and goose feathers, precious gifts from nature, has been successfully synthesized. Goose feathers possess high specific surface area due to their hierarchical structure and are mainly composed of thiol-rich proteins, e.g., keratin, which can reduce Au(III) and encapsulate the formed AuNCs in a large scale. The resultant golden feathers exhibit bright red luminescence under UV light, of which the substructures, i.e., barbs and barbules, have been sufficiently stained with red-emitting AuNCs. Furthermore, the AuNC-stained feathers maintain almost unchanged structure (solid and hierarchical) and intact chemical composition. The features of such AuNC/feather hybrids, e.g., bulk, high specific surface, inspired us to develop a facile method to prepare various valuable debris from AuNC-based etching, i.e., Au(I) complexes with aggregation-induced emission (AIE). We selected tris(2-carboxyethyl)phosphine and cysteamine as etchants, respectively, which have been previously reported to be able to synthesize AIE-featured Au(I) complexes through etching AuNCs protected by soluble protein. Conveniently, in this approach, the protein-free Au(I) complexes in solution can be attained simply by taking out with bare hand. After adding cation aggregation inducer, e.g., Cd2+, the non-emitting solution can generate bright luminescence, demonstrating the feasibility to synthesize the precious AIE-type Au(I) complexes. This study not only boosts the development of luminescent gold materials through rational use of natural product, enriching the library of gold nanomaterials, but also definitely provides a new view of nanoclusters as reagents to prepare other noble materials.
关键词： Aggregation induced emission,Gold nanoclusters,Chemical etching,Gold(I) complexes,Goose feathers
更新于2025-09-10 09:29:36