Jiawen Hu

Jiawen Hu
Hunan University · Department of Chemistry, College of Chemistry and Chemical Engineering

PhD

About

67
Publications
7,076
Reads
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2,139
Citations
Citations since 2017
26 Research Items
1112 Citations
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250

Publications

Publications (67)
Article
Synthesis of high-quality metal nanoparticles (NPs) is the premise toward their downstream diverse applications. Although some electrochemical synthesis strategies have been developed, the necessary use of high-concentration electrolyte solution as current pathway and reaction medium severely limits the colloidal stability of the growing NPs in the...
Article
Three-dimensional (3D) nanoporous gold (NPG) shows promising applications in various fields. However, its most common fabrication strategy (i.e., dealloying) faces the problems of high energy consumption, resource waste, the use of corrosive solvent, and residue of the sacrificial component. Here, we report a general bottom-up nanowelding strategy...
Article
Silver nanowire (Ag NW) films are the promising next-generation flexible, transparent conductors, but their transport properties are greatly deteriorated by the insulating polyvinylpyrrolidone (PVP) layer wrapping on the Ag NWs. Herein, we report a plasma treatment strategy to completely remove the PVP layer and meanwhile limitedly weld the Ag NW f...
Article
MicroRNAs (miRNAs) are related to many biological processes and regarded as biomarkers of disease. Rapid, sensitive, and specific methods for miRNA assay are very important for early disease diagnostic and therapy. In the present work, an ultrasensitive electrochemical biosensing platform has been developed for miRNA-21 assay by combining CRISPR-Ca...
Article
Silver nanowires (Ag NWs) are promising building blocks for next-generation flexible transparent conductors (TCs). However, the current industrial synthesis method for Ag NWs, i.e., the polyol reduction method, readily produces abundant byproducts of Ag nanoparticles and leaves an insulating polyvinylpyrrolidone (PVP) layer wrapped around the Ag NW...
Article
We report bulk phase-encoded surface-enhanced Raman scattering (SERS) tag, which uses a thin pinhole-free bulk phase of Raman-active polymer other than submonolayer molecules as the signal reporter. With a pinhole-free, highly cross-linked structure, the outer bulk phase shell not only offers ideal protection to the inner Au nanoparticles (signal a...
Article
This study reports a solution-processable strategy to interdigital electrodes (IDEs), via integrating synthesis of gold nanoparticles (AuNPs), interfacial self-assembly, and plasma welding. Particularly, we found that the usual plasma cleaning process can effectively weld AuNPs, making the self-assembled, patterned AuNP film form a highly interconn...
Article
Full-text available
Potassium‐based dual ion batteries (KDIBs) have attracted significant attention owing to high working voltage, high safety, low processing cost and environmental friendliness. Nevertheless, one great challenge for practical KDIBs is to develop suitable anode materials with high specific capacity. Herein, we report an architecture of hierarchically...
Article
Full-text available
The dependence of plasmon resonance on the size, shape, and interparticle spacing of single, isolated nanostructures inherently limits their light-harvesting capability to a narrow spectral band. Here, we report a facile overcurrent electrodeposition strategy to prepare fractal plasmonic black gold (B-Au) with broad-band absorption properties (over...
Article
Nanoporous gold film (NPGF) has shown great potential for photonics, catalysis, sensing, and renewable energy. Herein, we report a monolayered NPGF with tunable electrocatalytic activity for improved methanol electrooxidation and H2O2 detection. The NPGFs were fabricated via interfacial self-assembly of Au nanoparticles (NPs) with different sizes a...
Article
Full-text available
Potassium‐based dual‐ion batteries (KDIBs) have emerged as a new generation of rechargeable batteries, due to their high cell voltage, low cost, and the natural abundance of potassium resources. However, the low capacity and poor cycling stability largely hinder the further development of KDIBs. Herein, the fabrication of hierarchically porous N‐do...
Article
Capacitive deionization (CDI) is a promising technique for water treatment and desalination. To enable high CDI performance, the electrode materials should possess high surface area, conductivity, hydrophilicity, and cycling stability. Here, we report the design and construction of a hierarchical porous composite of N-doped hollow mesoporous carbon...
Article
Silver nanowire (Ag-NW) thin films are of considerable interest for next-generation transparent conductors (TCs). However, their carrier transport properties are largely plagued by the residual polyvinylpyrrolidone (PVP) ligands on surface that were introduced during the synthesis of the Ag-NWs. Here we report a rapid electrochemical cleaning strat...
Article
Capacitive deionization (CDI) has emerged as an attractive approach for desalination and water treatment for its high energy efficiency, low cost, and easy regeneration. Here, we report the preparation and application of villiform carbon fiber paper (v-CFP) as the current collector for CDI device with high areal electrosorption capacity. The v-CFP...
Article
Owing to the abundant resources of Ni and Fe elements, aqueous Ni/Fe battery has emerged as an attractive electrochemical energy storage device. However, the performance of the Ni/Fe battery is largely limited by the low specific capacity and poor discharge rate capacity of the Fe electrodes. Herein, we report a new Fe1-xS/reduced graphene oxide co...
Article
Capacitive deionization (CDI)has emerged as a promising energy-efficient, low cost technique for water treatment and desalination. Herein, we report a nitrogen-doped hierarchical porous carbon aerogel (N-HPCA)for high-performance CDI. The obtained N-HPCA possess a highly interconnected hierarchical porous structure, providing a large specific surfa...
Article
Full-text available
Two-dimensional (2D) nanosheets have attracted considerable recent interest for their atomically thin geometry and unique thickness-dependent electronic properties. The 2D nanosheets studied to date are generally limited to intrinsically layered materials, in which the covalently bonded atomic layers are held together by weak van der Waals forces a...
Article
Rationally designed electrode materials with high capacity, excellent stability, and good rate capability are essential for high-performance energy storage systems. This study reported the design of nickel-iron layered double hydroxides nanosheets and reduced graphene oxide composites (NiFe-LDHs/rGO composites) for high-capacity LIB electrode. The...
Article
Rationally designed electrodes with a high specific surface area, conductivity, and ion diffusion rate are essential for high performance supercapacitors. Hereby, we report the construction of a three-dimensional (3D) N- and S-codoped graphene hydrogel with abundant in-plane pores (NS-HGH). In NS-HGH, its highly interconnected network structure lar...
Article
We developed a theory for the fluorescence (FL) for quantum emitter and double metallic nanoshell dimer hybrids using the density matrix method. The dimer is made from two identical double metallic nanoshells, which are made of a dielectric core, a gold metallic shell and a dielectric spacer layer. The quantum emitters are deposited on the surface...
Article
Non-noble metal electrocatalysts have emerged as promising next-generation electrocatalysts for oxygen reduction reaction (ORR). Despite considerable progress, non-noble metal electrocatalysts are plagued by relatively low efficiency and poor long-term stability. This study reports the design and synthesis of holey Co, N-codoped graphene aerogel wi...
Article
Silver nanowire (Ag-NW) thin films have emerged as a promising next-generation transparent electrode. However, the current Ag-NW thin films are often plagued by high NW-NW contact resistance and poor long-term stability, which can be largely attributed to the ill-defined polyvinylpyrrolidone (PVP) surface ligands and non-ideal Ag-PVP-Ag contact at...
Article
This study reports the preparation of polystyrene/Ag nanoparticles(PS/Ag NPs) composite spheres and their catalytic application toward MB conversion. The composite spheres were prepared by synthesis of PS speres, their sulfonation, and finally reduction of [Ag(NH3)2]⁺ ions absorbed on sulfonated PS spheres using polyvinyl pyrrolidone. The resultant...
Article
Self-assembly of thiolated polyethylene glycol (PEG)-modifi ed Au nanoparticles (NPs) into a closely packed particle film at a water–air interface for the production of reproducible, highly active surface-enhanced Raman scattering (SERS) was developed. Upon modifi cation with thiolated PEG, the Au NPs can sustain severe conditions (e.g., 3 M NaCl s...
Article
Full-text available
Fluorescence intensity is vital for fluorescence sensing and imaging because it determines the sensing sensitivity and imaging brightness. This study reports plasmon-enhanced fluorescence by engineering plasmonic nanostructures, that are SiO2-coated Au nanoshell dimers with a high yield exceeding 60 %. With this elaborately designed nanostructure,...
Article
Bottom-up assembly of nanostructured thin films could offer an alternative low-cost approach to electronic thin films. However, such solution-processed thin films are often plagued by excessive inter-particle resistance and only exhibit limited current delivering capability. Here, we report a novel approach to fabricate highly conductive free-stand...
Article
Capacitive deionization is an attractive approach to water desalination and treatment. To achieve efficient capacitative desalination, rationally designed electrodes with high specific capacitances, conductivities, and stabilities are necessary. Here we report the construction of a three-dimensional (3D) holey graphene hydrogel (HGH). This material...
Article
High-efficient, plasmon-enhanced nonlinear phenomena based on hybrid nanostructures, which combine nonlinear dielectrics with plasmonic metals, are of fundamental importance for various applications ranging from all-optical switching to imaging or bio-sensing. However, the high loss of the excitation energy in nanostructures and the poor spatial ov...
Article
This work reports pH-induced oriented attachment growth of large Au nanoparticles (NPs) from zwitterionic ligand-modified 4 nm Au NPs. The growth process was examined using UV–vis spectroscopy and transmission electron microscopy. Our results show that the sulfonic acid group in the zwitterionic group is protonated at pH < 1.4. This leads to the fo...
Article
Particle dressed, SiO2 shell-isolated cavity architectures were fabricated, which, owing to their structured surface and substantial hot spots created by the particle-cavity interaction, shows reproducible, improved surface-enhanced Raman scattering activity relative to the Au nanoparticles immobilized on the glass slide.
Article
This work reports the use of monolayer colloidal crystal of polystyrene spheres as a template combined with electroless deposition to fabricate Ag through-sphere segment void (SSV) arrays. Experimental and theoretical (finite-difference time-domain) results reveal that the structured Ag through-SSV arrays create extraordinary optical transmission (...
Article
In this contribution, we report a reduced graphene oxide (rGO)-modified nitrogen-doped carbon xerogel, which could be easily prepared by pyrolysis of melamine-formaldehyde (MF) resins that are polymerized hydrothermally in an aqueous GO dispersion. Scanning electron microscopy, transmission electron microscopy, Fourier-transformed infrared spectrom...
Article
In this paper, we systematically investigated the synthesis of Au@SiO2 NPs in isopropanol medium using Frens Au colloids as seeds. It shows that the yield of mononucleate Au@SiO2 NPs is dependent on the amount of the catalyst added, the feeding rate of the silicon source, and especially the number density of the Au seeds introduced. Following these...
Article
We report the application of borrowed SERS to SERS-inactive SiO2, which is achieved by coating an ultrathin, pinhole-free SiO2 layer on a roughened Au electrode. The ultrathin SiO2 layer allows the transfer of the long-range electromagnetic fields created by the underlying Au to the SiO2 surface, achieving SERS therein (i.e., borrowed SERS). The pi...
Article
Large-area submonolayer and monolayer Au nanoparticle (NP) arrays with sub-5 nm nanobowl gaps for giant electromagnetic enhancement were created by partially embedding SiO2-coated Au NP arrays in an electrochemically deposited Au film, followed by the removal of the SiO2 shells.
Article
Surface plasmon resonance-based optical properties for gold nanovoid arrays were analyzed using three-dimensional finite-difference time-domain method, revealing that two asymmetric Fano resonances, with extremely low reflectivity and narrow line width, are caused by the strong interference between localized quadrupolar and hexadecapolar modes and...
Article
We report borrowed surface-enhanced Raman scattering (SERS) at Pd and Pt films deposited on Au sphere segment void (SSV) SERS substrates and show that ultrathin, pinhole-free Pd and Pt films could be easily achieved by choosing constant-current deposition for the Pd deposition and under-potential deposited Cu-mediated deposition for the Pt depositi...
Article
In this work, the stability and reversible aggregation properties of zwitterion-modified Au nanoparticles (Au NPs) were studied under acidic and alkaline conditions. The UV-Vis spectra of the Au colloids were measured under different conditions, and the stability and reversible aggregation properties of the Au colloids were revealed through the spe...
Article
Full-text available
In this work, salt- and pH-resistant gold nanoparticles were obtained by decorating their surfaces with mixed-charge zwitterionic ligands, and their concentration was changed by exploiting their pH-induced reversible aggregation properties.
Article
We report salt-induced size-selective separation, concentration, and preservation of Au nanoparticles, which are based on their size-dependent critical coagulation concentration and reversible aggregation properties imparted by zwitterion ligand.
Article
The immunoassay application of sterically stabilized, surface-enhanced Raman scattering (SERS)-tagged Au nanorod (NR) probes was reported. The probes were prepared by coadsorbing Ramanactive molecule 4-mercaptobenzoic acid and biocompatible α-mercapto-ω-carboxyl polyethylene glycol onto the surfaces of Au NRs. The long PEG chain provides both prote...
Article
We report the preparation of water-soluble, surface-enhanced Raman scattering (SERS)-tagged Au nanorod (NR) probes. That was accomplished by direct ligand exchange of the initial stabilizer with a synthesized Raman-active poly(ethylene glycol) (PEG). The SERS-tagged Au NR probes were characterized by transmission electron microscopy, SERS, and UV–V...
Article
An environment-friendly method is developed to fabricate close-packed Au nanoparticle (AuNP) monolayers with sub-10 nm interparticle spacing simply by covering n-butanol on the surface of an Au aqueous colloid. The close-packed nanostructure can further transform into two-dimensional (2D) aggregates with different aggregation degrees upon aging for...
Article
We reported sonication-mediated film assembly of gold nanoparticles at a water/hexane interface used as a surface-enhanced Raman scattering(SERS) substrate. Gold colloids/hexane biphasic system was emulsified by sonication, and then the emulsions were left undisturbed to allow natural breaking emulsions. In the end, gold nanoparticle films were for...
Article
Full-text available
We report self-assembly of charge-stabilized gold and silver nanoparticles at water-air and water-oil interfaces, via manipulation of the interactions between the interfaces and the adsorbing nanoparticles. Nanoparticle adsorption from bulk colloids to an interface is an energy-favored, but finite sorption barrier-restrained (kinetics-controlled) p...
Article
Full-text available
The stability of α-methoxy-ω-mercapto-poly(ethylene glycol) (mPEG-SH, MW 5000) modified gold colloids was investigated, and the corresponding stability mechanism was preliminarily interpreted. Linear mPEG-SH molecules were chemically bonded to gold particle surfaces via the end group, SH, forming polymer brush-coated gold colloids. Experimental res...
Article
An immunoassay detection based on surface-enhanced Raman scattering (SERS) from gold nanorods (NRs) was studied. Raman active molecule 4-mercaptobenzoic acid was adsorbed on gold NRs, forming SERS-tagged gold nanoprobes. Upon adsorption of antibody to the nanoprobes, the antibody was tagged by SERS. Through the immunoassay reactions among the SERS-...
Article
We report the study correlating the shape, surface plasmon resonance (SPR), and surface-enhanced Raman scattering (SERS) of gold nanorods (NRs) in dilute colloids. A series of gold NRs with various aspect ratios was prepared via an improved seed-mediated technique. Increasing the aspect ratio finely tunes the position of the longitudinal plasmon mo...
Article
A model ternary heparin conjugate by direct covalent bond strategy has been developed, in which modified heparin using active mix anhydride as intermediate conjugates with model drug molecule and model specific ligand, respectively. Designed ester bonds between model drug and heparin facilitate hydrolysis kinetics research. The strategy can be exte...
Article
Full-text available
We utilized the strategy of 'borrowing SERS activity', by chemically coating several atomic layers of a Pt-group metal on highly SERS-active Au nanoparticles, to obtain the first SERS (also Raman) spectra of surface water on Pt and Pd metals, and propose conceptual models for water adsorbed on Pt and Pd metal surfaces.
Conference Paper
When anticancer drug, paclitaxel, is clinically used, solubility and toxicity are two major problems. To overcome these problems, in the present study, we design a targeted anticancer drug delivery system, which contains drug, drug carrier, and target-differentiated ligand. The key point is that both of paclitaxel and target-differentiated ligand,...
Article
We report the synthesis and characterization of gold core palladium shell (Au@Pd) nanoparticles with thickness-controlled shell as an improved transition-metal substrate for surface-enhanced Raman scattering (SERS). By changing the molar ratio of H2PdCl4 to Au, the Pd shell thickness can be precisely controlled from a few nanometers down to ca. one...
Article
Full-text available
This discussion focuses on our recent approaches at aiming to optimize surface-enhanced Raman scattering (SERS) activity for transition metals (group VIII B elements), by intentionally fabricating desired surface nanostructures or synthesizing nanoparticles. The SERS activity of transition metals critically depends on the surface morphology of elec...
Article
Pinhole-free Au core Pd shell (Au@Pd) nanoparticles with controllable size were synthesized, and the optical properties of the nanoparticles can be tuned by varying the size of the core and the thickness of the shell. The Au@Pd nanoparticles were characterized with TEM, HRTEM, UV-Vis absorption spectroscopy and SERS. Through a systematic study of t...
Article
A study on the fabrication and characterization of gold nanowires containing a 4,4'-azopyridine monolayer junctions was reported. Au nanowires were prepared by using a two-step alternative current (AC) electrodeposition inside the pores of AAO. Azopyridine molecules were adsorbed on the top of Au layer by self-assembly and electroless plating was d...
Article
Au core Pd shell (Au@Pd) nanoparticles with controllable size from 35 to 100nm were prepared by chemical deposition of Pd over pre-formed 12nm Au seeds. Both transmission electron microscopy and UV–visible spectroscopy studies confirmed the core–shell structure of the synthesized nanoparticles. The Au@Pd nanoparticles dispersed on a polished Pt ele...
Article
In our previous paper, a method for preparing enormous surface-enhanced Raman scattering (SERS) active substrates through the aggregation of silver particles trapped at an air-water interface was reported. Here, further efforts were devoted to investigate the origin of assembling silver particle films by adsorbing nanoparticles from bulk colloids t...
Article
Annealing at 400°C for 1-2 h is applied to peened 1Cr18Ni9Ti alloy, and the high-temperature oxidation properties are studied. SEM, XRD and oxidation kinetics results show that shot peening promotes the formation of protective Cr2O3 scale, but the adhesion property of oxide scales is poor due to the increased compressive stress. The stress in the s...
Article
This paper describes a surface-enhanced Raman spectroscopic study on nickel electrodes. The enhancement factor of the roughened Ni substrate was found to be from two to three orders, depending on the surface pre-treatment. High-quality SERS spectra of pyrazine and pyridine were obtained at different potentials. The bands assigned to Ni–Npyrazine an...
Article
Full-text available
Surface-enhanced Raman scattering (SERS) of 4-mercaptopyridine (4-mpy) adsorbed on HNO3 etched silver foil, chemically deposited silver films (silver mirror) and silver colloids were measured. The SERS study has revealed that 4-mpy was adsorbed onto the three kinds of silver surfaces by a sulfur-silver bond with the plane of pyridine ring being nor...
Article
Silver colloids are one of the extensively employed surface-enhanced Raman scattering (SERS) active substrates. To obtain the SERS effect, their aggregation upon addition of analyte is necessary. However, problems of instability and irreproducibility in the magnitude of the signal are caused by the formation of aggregates. Considering that the aggr...
Article
In this paper, we propose a novel technique for the fabrication of active substrates of surface-enhanced Raman scattering (SERS). It was found that the silver particles themselves and the analyte-covered silver particles can be trapped at the air-water interface. In the presence of electrolyte, for example, KCl that is generally used to activate si...
Article
Large, monodisperse core-shell Au-Ag nanoparticles with Ag-like optical properties have been prepared by the seeding growth method in micellar media.
Article
We have found that the silver colloids, which usually used as SERS active substrate, are inclined to aggregation on air-water interface and forming a two-dimension silver particle films. The formed silver, particle films exhibit, much higher surface Raman enhancement factor than silver colloids, and the power used on silver particle films is only a...

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