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Introduction
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August 2005 - present
Publications
Publications (67)
The effective detection of hazardous gases has become extremely necessary for the ecological environment and public health. Interfacial engineering plays an indispensable role in the development of innovative materials with exceptional properties, thus triggering a new revolution in the realization of high-performance gas sensing. Herein, the ratio...
Defect and interlayer engineering are considered as two promising strategies to alter the electronic structures of sensing materials for improved gas sensing properties. Herein, ethylene glycol intercalated Al-doped SnS2 (EG-Al–SnS2) featuring Al doping, sulfur (S) vacancies, and an expanded interlayer spacing was prepared and developed as an activ...
Promoting charge migration and enhancing redox ability of photogenerated carriers are important for the development of highly efficient semiconductor-based photocatalyst. Here, BiOBr/Bi2Sn2O7 heterojunction with oxygen vacancies (OVs) was constructed by homogeneously depositing Bi2Sn2O7 nanoparticles on the Vo-BiOBr surface. The experimental result...
Layered tin diselenide (SnSe2) has aroused widespread scientific interest by virtue of its exceptional chemical, physical, and electrical characteristics. The distinctive features of SnSe2enable it to be an ideal candidate for efficient detection of NO2at room temperature. Herein, hierarchical SnSe2assembled from thin nanosheets was designed and pr...
The slow response and incomplete recovery are primary bottlenecks for the sensing performance of 2D transition-metal dichalcogenides (TMDs) at room temperature, which hinders their development for state-of-the-art gas sensors. Herein, we engineered N doped p-type MoS2 against its native n-type propensity to enable a rapid room-temperature response/...
Advanced semiconductor heterostructures based on 2D materials present fascinating chemical, electronic, and geometric effects on chemical sensing and hold a great promise for developing high-performance gas sensors. However, the conventional tandem heterostructures may suffer from severe defect scattering as well as inferior heterointerface, thus l...
A core-shell structured dual Z-scheme ternary photocatalyst BiVO4@ZnIn2S4/Bi2Sn2O7 was fabricated via hydrothermal and heat-circumfluence strategy. With ZnIn2S4 serving as a bridge to connect BiVO4 and Bi2Sn2O7, the developed ternary catalyst displayed boosted charge transfer and spatial separation capabilities. The effect of mass ratios of BiVO4@Z...
Constructing heterostructures could endow materials with exceptional properties in gas sensing applications owing to the boosted interfacial charge transfer. The rational design and controllable synthesis of heterostructures with a high-quality interface, however, still remains a challenge. Herein, the novel Sn atom cosharing SnO2/SnSe2 heterostruc...
Two-dimensional layered metal dichalcogenides (LMDs) SnS2 is an arresting candidate for high-performance NO2 gas sensors. However, most SnS2-based NO2 sensors are usually inert for detecting ppb-level NO2 at room temperature...
The ever-increasing concerns over air quality and the newly emerged internet of things (IoT) for future environmental monitoring are stimulating the development of ultrasensitive room-temperature gas sensors, especially for NO2, one of the most harmful air pollution species released round-the-clock from power plants and vehicle exhausts. Herein, Sn...
Reactive oxygen species (ROS) as one kind of oxygen-dependent toxic free radical has been widely adopted in ROS-mediated therapies (RMT). However, two shackles, known as tumor hypoxia and high intratumor glutathione (GSH) levels, respectively, limit RMT as the former prevents ROS from generating, while the latter scavenges the ROS generated. Herein...
Heterojunction engineering plays an indispensable role in improving the gas sensing performance. However, rational heterojunction engineering to achieve a room-temperature NO2 sensing with both high response and rapid recovery is still a challenge. Herein, a 2D/2D heterojunction of g-C3N4/SnS2 is designed to improve the sensing performance of SnS2...
A core/shell/shell structure nanoparticle with anticancer drug and dual-photosensitizer co-loading for synergistic chemotherapy and photodynamic therapy was developed. The nanoparticle contains an upconversion nanoparticle (UCNP) core, a middle silica shell with the first photosensitizer (PS) methylene blue (MB) encapsulated, and an outside mesopor...
The rapid recombination and poor redox capability of photoinduced charge carriers seriously impede the photocatalytic activity. Herein, a direct Z-scheme photocatalyst was fabricated by selectively depositing Ag6Si2O7 nanoparticles (NPs) on the {0 4 0} facets of BiVO4. Owing to the facet-dependent band structure of BiVO4, the photoinduced electrons...
Although the combined chemotherapy (Chemo), photothermal (PTT) and photodynamic (PDT) in cancer therapy, has drawn massive attention due to superior anticancer ability, the required high intensity of irradiation brings serious photo-toxicity to healthy neighbor cells and thus limits its biomedical applications. Herein, we developed ultralow-intensi...
Efficiently harvesting solar energy for photocatalysis remains a challenge because near infrared (NIR) light with low excitation energy cannot be directly utilized by general semiconductor photocatalysts, although it makes up 46% in solar spectrum. Herein, a broad-spectrum photocatalyst with pollutant adsorption-enrichment capability to enable a na...
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Synergistic cancer starvation/ROS-mediated/chemo- therapy is developed through a cascade reaction with enzyme glucose oxidase (GOX) modified on the surface of Fe-based metal organic framework (MOF(Fe)) and drug camptothecin (CPT) loaded into the cavities of MOF(Fe). Once internalized by tumor cells, GOX catalyzes endogenous glucose into hydrogen pe...
Although photodynamic therapy (PDT), which use photosensitizer (PS) to generate toxic reactive oxygen species (ROS) upon laser irradiation to kill cancer cells, has been widely applied, the required high laser intensity brings photodamage to healthy neighbor cells and limits its success. Furthermore, glutathione (GSH, an antioxidant) is overexpress...
Unique features of SnS2 make them a sensitive material ideal for preparing high-performance nitrogen dioxide (NO2) gas sensors. However, sensors based on pristine tin disulfide (SnS2) fail to work at room temperature (RT) owing to their poor intrinsic conductivity and weak adsorptivity toward target gas, thereby impeding their wide application. Her...
Junhui Shi,1 Zhengyan Zhao,2 Zongjun Liu,3 Ruozheng Wu,1 You Wang11School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China; 2State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, People’s Republic of China; 3School of Chemistry and Chemical Engineering,...
A novel light-responsive nanovalve is facilely prepared on mesoporous silica (mSiO2) coated upconversion nanoparticles (UCNP) through modification of photo-cleavagable pyrenemethyl ester (Py) molecules on its surface. These Py molecules can associate with β-cyclodextrin (β-CD) molecules as gatekeepers to block the mSiO 2 pore channels and entrap th...
Although photodegradation is the most widely studied method for the purification of water, the challenges for the post‐separation of catalysts from water prevent the technique from practical applications. In this study, separation‐free TiO₂/reduced graphene oxide films were first prepared by layer‐by‐layer assembly of TiO₂ and graphene oxide on qua...
An on-demand drug delivery nanoplatform based on mesoporous silica (mSiO2) coated upconversion nanoparticles (UCNP@mSiO2) with a novel near infrared (NIR) light-triggered hydrophobic-to-hydrophilic switch nanovalve was fabricated. The surface of UCNP@mSiO2 was first immobilized with hydrophobic 2-Diazo-1,2-naphthoquinones (DNQ) guest molecules. Aft...
SnS2 nanosheets with unique properties are excellent candidate materials for fabricating high-performance NO2 gas sensors. However, serious restacking and aggregation during sensor fabrication have greatly impacted sensing response. In this study, a flower-like hierarchical SnS2 was prepared by a simple microwave method and partially thermal oxidiz...
Crystallographic and topographical evolutions of cylinder patterned sapphire substrate (PSS) under an ordinary wet etching condition (H2SO4:H3PO4 = 5:1 at volume ratio, 230°C) were systematically studied using complementary SEM and AFM characterizations. The strongly time-dependent crystallographic and topographical evolutions of cylinder protrusio...
Three polyhedral oligomeric silsesquioxanes (POSSs), OctaTetraMethylAmmonium-POSS (OTMAP), DodecaPhenyl-POSS (DPP), and OctaMethyl-POSS (OMP) were heated to explore their potential as preceramic POSSs for ceramic materials, under a three-step pyrolysis technique (25–500 °C/4 h, 500–1000 °C/6 h and 1000–1500 °C/8 h, 10 °C/min in N2). The chemical an...
Metal oxide/graphene nanocomposites are emerging as promising materials for developing room-temperature gas sensors. However, the unsatisfactory performances owing to the relatively low sensitivity, slow response, and recovery kinetics limit their applications. Herein, a highly sensitive and rapidly responding room-temperature NO2 gas sensor based...
A novel photodynamic therapy nanoplatform based on mesoporous silica-coated upconverting nanoparticles (UCNP) with electrostatic-driven ultrafast photosensitizer (PS) loading and 808 nm near infrared (NIR) light triggering capabilities has been fabricated. By positively charging inner channels of the mesoporous silica shell with amino groups, a qua...
Competitive binding activated nanovalves (CBAN) with on-demand activation capability are fabricated through switching from host-guest complexation to decomplexation upon the introduction of competitive guest (C-guest) molecules. Guest molecules of pyrene or naphthalene are used to associate with β-cyclodextrin (β-CD) host to form supramolecular com...
Upconversion nanoparticles (UCNPs) with fascinating properties hold great potential as nanotransducers for solving the light penetration problem that traditional photodynamic therapy (PDT) is facing. In this report, the synthesis and utility of UCNPs/silica core-shell structured nanoparticles for upconversion (UC) PDT and imaging of THP-1 macrophag...
Epitaxial thin films of Ba0.7Sr0.3TiO3 (BST) were grown on the designed vicinal single-crystal LaAlO3 (001) substrates to systematically investigate the evolution of microstructures and in-plane dielectric properties of the as-grown films under the strains induced by surface step terraces. Anisotropic dielectric properties were observed, which can...
A thorough understanding about the crystallographic and topographical evolution of wet-etched patterned sapphire substrates (PSS) is essential for revealing the etching mechanism and critical for fabricating optimized PSS for enhanced performance of GaN-based LED devices. As the first one of a series of three papers, using complementary scanning el...
Here we present a systematic study on crystallographic and topographical evolutions as well as etching rates of crystallographic planes of cone-shaped patterned sapphire substrate (PSS) etched in H2SO4 and H3PO4 mixture with a wide range of volume ratios (H2SO4:H3PO4 = 1:0, 5:1, 3:1, 1:1, 1:3, and 0:1) at 230°C. The Miller indexes of four major exp...
The effect of etching temperature (473–543 K) on the crystallographic and topographical evolutions as well as the etching rate of crystallographic planes of cone-shaped patterned sapphire substrate (PSS) etched in both H2SO4-based (H2SO4:H3PO4 = 5:1 at volume ratio) and H3PO4 etchants was systematically studied. For H2SO4-based etchant, higher temp...
Controllable interfacial strain can manipulate the physical properties of epitaxial films and help understand the physical nature of the correlation between the properties and the atomic microstructures. By using a proper design of vicinal single-crystal substrate, the interface strain in epitaxial thin films can be well controlled by adjusting the...
A multifunctional platform with pH-responsive drug release and near-infrared (NIR) light-triggered photodynamic therapy (PDT) was designed and prepared using the novel core–shell–shell structure. The multifunctional platform consists of an upconversion nanoparticle (UCNP) emission core, a photosensitizer methylene blue (MB) embedded dense silica sa...
In this study, we report UV-MALDI-TOF MS evidence of a fullerene-like silsesquioxane, a high-symmetry polyhedral oligomeric silsesquioxane (POSS or SSO) formulated as R60-Si60O90 or T60 (T = RSiO1.5). The T60 preparation can be performed using a normal hydrolytic condensation of [(3-methacryloxy)propyl]trimethoxysilane (MPMS) as an example. Theoret...
Triple-doped (Yb(3+)/Er(3+)/Tm(3+)) KMnF3 nanocubes with uniform sizes of 250 nm were synthesized by a facile hydrothermal route using the oleic acid as the capping agent. It was found that these nanocubes can simultaneously exhibited four-color (blue, green, red and NIR) upconversion emissions under a single 980 nm near-infrared (NIR) laser excita...
C-doped WO3 based room temperature hydrogen sensors including nanoparticle cluster arrays and nanorods were successfully prepared by a PS-b-P4VP template based method. AFM, TEM and XPS are used to characterize the structure and composition of samples. Analyses indicate that the C-doped WO3 nanoparticle cluster arrays are arranged in a beautiful hex...
Atherosclerosis (AS) is the most vital cardiovascular disease, which poses a great threat to human health. Macrophages play an important role in the progression of AS. Photodynamic therapy (PDT) has emerged as a useful therapeutic modality not only in the treatment of cancer but also in the treatment of AS. The purpose of this study was to determin...
Contact geometry significantly influences adhesive force measurements and modeling for adhesion/friction studies where AFM colloidal probe technique has been extensively employed. Here we present the systematic study on topography alteration of silica microspheres sliding on mica, sapphire and glass substrates under ambient conditions with relative...
Functionalized silica sols were obtained by the hydrolytic condensation of (gamma-methacryloxypropyl) trimethoxysilane (MPMS), (gamma-glycidyloxypropyl) trimethoxysilane (GPMS) and tetraethoxysilane (TEOS). Three different sols were obtained: MPS (derived from MPMS and TEOS), GPS-MPS (derived from GPMS, MPMS and TEOS), and GPSD (derived from GPMS,...
One-dimensional mesoporous TiO2-Bi2WO6 hollow superstructures are prepared using a hydrothermal method and their photocatalysis and recycle properties are investigated. Experimental results indicate that anatase TiO2 nanoparticles are coupled with hierarchical Bi2WO6 hollow tubes on their surfaces. The TiO2-Bi2WO6 structure has a mesoporous wall an...
This paper presents a simple strategy that enables the two-dimensional self-assembly of an amphiphilic polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) diblock copolymer into a variety of nanoscopic aggregates to proceed on a solid substrate. After being made by dripping several drops of PS-b-PMMA dilute solution in toluene on mica, the samp...
One-dimensional hierarchical Bi2WO6 hollow tubes with porous walls have been solvothermally synthesized using Bi2O3 rods as both template and reactant, and characterized by FESEM, TEM and XRD. Experimental results indicate that the walls of these micro-tubes are made of Bi2WO6 nanoplates stacking in a disordered state, which creates an interesting...
Conductive composite poly (p-phenylenediamine)/graphene oxide/Au (PPD/GO/Au) is synthesized via in situ polymerization with p-phenylenediamine (PDA) used as monomer and HAuCl4 as oxidant and Au source in the presence of graphene oxide (GO). The composite is characterized by FESEM, FT-IR and XRD, and the effect of reaction time and temperature, mass...
Complicated nano-patterns with linewidth less than 18 nm can be automatically hammered by using atomic force microscopy (AFM) tip in tapping mode with high speed. In this study, the special sample was thin poly(styrene-ethylene/butylenes-styrene) (SEBS) block copolymer film with hexagonal spherical microstructures. An ordinary silicon tip was used...
As many properties of polymer thin films critically depend on their thickness, a convenient and cost-effective method for precise measurement of film thickness in a wide range is highly desirable. Here, we present a method which enables polymer film thickness, ranging from nanometer to micrometer scale, to be facilely determined by measuring the he...
Nanolithography at low cost and high speed is made possible by using a vibrating AFM tip in tapping-mode as a nanohammer to forge polystyrene-block-poly(ethylene/butylenes)-block-polystyrene triblock copolymer monolayer thin films after annealing to transform their microstructures from as-cast poorly ordered cylinders into well-ordered hexagonal sp...
The morphology evolution of poly(styrene-ethylene/butylene-styrene) monolayer thin films upon "annealing" in the vapor of cyclohexane, a selective solvent for majority poly(ethylene/butylene) block, was investigated by atomic force microscopy (AFM). The pathway information on the two-dimensional ordering from poorly ordered short cylinders, to alig...
The direct contact between tip and sample in atomic force microscopy (AFM) leads to demand for a quantitative knowledge of the AFM tip apex geometry in high-resolution AFM imaging and many other types of AFM applications like force measurements and surface roughness measurements. Given, the AFM tip apex may change continuously during measurements d...
A simple relocation technique for atomic force microscopy (AFM), which takes advantage of multi-wall carbon nanotube (MWCNT), is used for investigating repeatedly the imaging of some specific species on the whole substrate with a high relocation accuracy of tens of nanometers. As an example of the application of this technique, Tapping Mode AFM ex...
Synthesis and characterization of water-soluble insulated semiconducting polymers, based on polythiophene and polyfluorene with β-cyclodextrins as the insulating sheath. Molecule sizes were evaluated by SANS and AFM. In addition to enhancing solubility, this sheath also makes the conjugated polymer insulated so its structure approaches a molecular...
The kinetic mechanism of structure healing after unloading from large elongation for styrene–butadiene–styrene (SBS) block copolymer materials was investigated by following their residual deformation recovery behaviors upon annealing. A linear relationship was found to exist between the deformation recovery percentage and the logarithm of time at d...
In this paper, we focus on better understanding tapping-mode atomic force microscopy (AFM) data of soft block copolymer materials with regard to: (1) phase attribution; (2) the relationship between topography and inside structure; (3) contrast-reversal artifacts; (4) the influence of annealing treatment on topography. The experiments were performed...
Typically, thin films of the conjugated oligomer p-bis[(p-styryl)styryl]benzene (P5V4) prepared by vacuum deposition on substrates like silicon wafers and quartz plates are polycrystalline. Atomic force and electron microscopy reveal elongated clusters with characteristic dimensions of 20×80 nm2. X-ray and electron diffraction (ED) measurements ind...
A series of silver colloidal dispersions were prepared by two protocols, i.e., addition of the reductant-NaBH(4) and the stabilizer-thiosalicylic acid (TSA) into Ag(+) solution simultaneously or successively. The products were compared and characterized by TEM, electrochemical measurements, XPS, UV-vis, and FT-IR spectra. The size distributions of...
Atactic-polystyrene (a-PS) films cast from solutions of different concentrations in dichloromethane under vacuum conditions were prepared. Their tensile mechanical behavior has been studied. It was found that the tensile strength of films cast in vacuum increases significantly with the solution concentration when the solution concentration is above...
The morphology of poly(styrene-ethylene/butylene-styrene) (SEBS) triblock copolymer ®lms cast from the solution in xylene at different temperatures was investigated by transmission electron microscope. The SEBS solution was ®rst heated to a certain temperature, which ranges from 20 to 1408C and then cast onto the surface of phosphoric acid at the s...
Projects
Projects (4)
Fabricating dimension-controlled, large-area and highly ordered nanostructured materials via self-assembled templates; preparing nanostructured functional materials for designate application via self-assembly techniques.
1) Physical and chemical processing techniques based on AFM tip, including the processing principle, nanomechanical model and reversibly thermal erase kinetic model.
2) Nanofabrication technique based on self-assembly of block copolymer; ordering mechanism study of self-assembled templates for nano-processing; controlling the assembly pathway to achieve precise regulation of assembled nanostructures;
3) Real-time, in situ and high resolution dynamic characterization of nanostructured materials.
This research thrust focuses on synthesizing functional nanomaterials for atmospheric environment detection and waste water treatment, realizing highly sensitive, rapidly in-situ detection of gaseous pollutants and efficient removal of water pollutants; aiming to access to practical and commercial applications.
1) Design and fabrication of gas sensors based on 3D Graphene nanostructures; macroscopically-controlled preparation of high-quality Graphene-based carbonaceous materials; fabrication of carbonaceous nanomaterials for gas sensing.
2) Force sensor and force-measuring sensor;
3) Design and fabrication of two-dimensional composited photocatalysts based on Graphene and other functional nanomaterials via Layer-by-Layer techniques.