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Lu T.,Engineering Research Center for Nanophotonics and Advanced Instrument | Zhang Y.,Engineering Research Center for Nanophotonics and Advanced Instrument | Li H.,Engineering Research Center for Nanophotonics and Advanced Instrument | Pan L.,Engineering Research Center for Nanophotonics and Advanced Instrument | And 2 more authors.
Electrochimica Acta | Year: 2010

Graphene, graphene-ZnO and graphene-SnO2 films were successfully synthesized and used as electrode materials for electrochemical supercapacitors, respectively. The screen-printing approach was employed to fabricate graphene film on graphite substrate while the ZnO and SnO2 were deposited on graphene films by ultrasonic spray pyrolysis. The electrochemical performances of these electrodes were comparatively analyzed through electrochemical impedance spectrometry, cyclic voltammetry and chronopotentiometry tests. The results showed that the incorporation of ZnO or SnO2 improved the capacitive performance of graphene electrode. Graphene-ZnO composite electrode exhibited higher capacitance value (61.7 F/g) and maximum power density (4.8 kW/kg) as compared with graphene-SnO2 and pure graphene electrodes. © 2010 Elsevier Ltd. All rights reserved.


Li H.,Engineering Research Center for Nanophotonics and Advanced Instrument | Nie C.,Engineering Research Center for Nanophotonics and Advanced Instrument | Pan L.,Engineering Research Center for Nanophotonics and Advanced Instrument | Sun Z.,Engineering Research Center for Nanophotonics and Advanced Instrument
Desalination and Water Treatment | Year: 2012

Membrane capacitive deionization (MCDI) is a promising technology for desalination with the potential of lowering energy consumption and treatment cost. In this paper, batch mode experiments were carried out to evaluate the charge efficiency of the MCDI process. Specifically, charge efficiency is a very functional tool to examine the double layer structure inside of porous electrode. The results show that the charge efficiency in MCDI is a function of both cell voltage and solution conductivity. Specifically, it was found that the charge efficiency was proportional to cell voltage while inversely to solution conductivity. The maximum charge efficiency (0.55) in MCDI was far less than one, indicating the high transient resistivity between membrane and carbon electrodes. © 2012 Desalination Publications. All rights reserved.


Liu X.,Engineering Research Center for Nanophotonics and Advanced Instrument | Lv T.,Engineering Research Center for Nanophotonics and Advanced Instrument | Pan L.,Engineering Research Center for Nanophotonics and Advanced Instrument | Sun Z.,Engineering Research Center for Nanophotonics and Advanced Instrument | Sun C.Q.,Nanyang Technological University
Desalination and Water Treatment | Year: 2012

ZnO sheets have been synthesized via microwave-assisted reaction of ZnO precursor in aqueous solution using a CEM microwave system. Their morphologies, crystal structures and photocatalytic performances in the reduction of Cr(VI) were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction spectroscopy and UV-vis absorption spectrophotometer, respectively. Results show that ZnO sheets synthesized in 5 min time scale exhibits a optimal photocatalytic performance in the reduction of Cr(VI) with removal efficiency of 81% under UV irradiation due to the maximal intensity of light absorption and the minimal probability of electron-hole pair recombination. © 2012 Desalination Publications. All rights reserved.


Yu W.,Engineering Research Center for Nanophotonics and Advanced Instrument | Liu X.,China Jiliang University | Chu H.,China Jiliang University | Zhu G.,Suzhou University | And 5 more authors.
Journal of Molecular Catalysis A: Chemical | Year: 2015

We synthesized the Ag2O/F-TiO2 composites via an aqueous precipitation method and characterized their morphology, structure and photocatalytic activity in the degradation of methylene blue (MB) using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis absorption spectroscopy, and electrochemical impedance spectra, respectively. The results show that the Ag2O addition could enhance the visible light photocatalytic activity of Ag2O/F-TiO2 composites with a maximum MB degradation rate of 93% for 60 min, much higher than that of the F-TiO2 (30%). The excellent photocatalytic activity is due to the increased visible light absorption, and promoted separation of photo-generated electrons and holes in F-TiO2 with the introduction of Ag2O. © 2015 Elsevier B.V. All rights reserved.


Xu S.,East China Normal University | He W.,East China Normal University | Shi C.,East China Normal University | Zhang R.,East China Normal University | And 3 more authors.
ICSICT-2010 - 2010 10th IEEE International Conference on Solid-State and Integrated Circuit Technology, Proceedings | Year: 2010

In this paper, a 3.18∼4.258GHz wideband and low phase noise LC VCO is proposed. Three binary-weighted switching capacitors are exploited to expand the bandwidth; On-chip LDO is utilized to suppress noise from power supply. Symmetrical noise filtering technique is used to suppress thermal noise from tail current and parasitic resistors of bonding wires. The circuit is implemented with 0.13μm RF CMOS process. The frequency tuning range is from 3.18GHz to 4.258GHz and phase noise is -120dBc/Hz at 1MHz offset from 4.258GHz carrier. The Figure of Merit (FOM) is -181dB/Hz and maximum power consumption is 12.5mW. ©2010 IEEE.


Zhu F.,Engineering Research Center for Nanophotonics and Advanced Instrument | Chen X.,Engineering Research Center for Nanophotonics and Advanced Instrument | Lu Z.,Engineering Research Center for Nanophotonics and Advanced Instrument | Yang J.,Anhui University | And 2 more authors.
Nano-Micro Letters | Year: 2014

ZnO thin film was fabricated on tin-doped indium oxide electrode as an electron selective layer of inverted polymer solar cells using magnetron sputtering deposition. Ionic liquid-functionalized carbon nanoparticles (ILCNs) film was further deposited onto ZnO surfaces by drop-casting ILCNs solution to improve interface properties. The power conversion efficiency (PCE) of inverted polymer solar cells (PSCs) with only ZnO layer was quickly decreased from 2.7% to 2.2% when the thickness of ZnO layer was increased from 15 nm to 60 nm. However, the average PCE of inverted PSCs with ZnO layer modified with ILCNs only decreased from 3.5% to 3.4%, which is comparable to that of traditional PSCs with poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) anode buffer layer. The results suggested that the contact barrier between ZnO layer and poly(3-hexylthiophene) and phenyl-C61-butyric acid methylester (P3HT:PCBM) blended film compared to ZnO bulk resistance can more significantly influence the performance of inverted PSCs with sputtered ZnO layer. The vanishment of negative capacitive behavior of inverted PSCs with ILCNs modified ZnO layer indicated ILCNs can greatly decrease the contact barrier of ZnO/P3HT:PCBM interface. © 2014, Shanghai Jiao Tong University (SJTU) Press.


Li H.,Engineering Research Center for Nanophotonics and Advanced Instrument | Li H.,University of South Australia | Pan L.,Engineering Research Center for Nanophotonics and Advanced Instrument | Zhang Y.,Engineering Research Center for Nanophotonics and Advanced Instrument | And 4 more authors.
Chemical Physics Letters | Year: 2010

The carbon nanotubes and carbon nanofibers composite films (CNTs-CNFs) were fabricated by chemical vapor deposition. The electrosorption performance of CNTs-CNFs films at different solution temperatures was studied. It is found that the salt removal decreases from 45.4% to 33% due to hydrophobic-hydrophilic transition taking place on the surface of CNTs-CNFs films, when solution temperature ranges from 281 to 295 K. The electrosorption isotherm investigation shows Langmuir isotherm can better describe experimental data. Meanwhile, the kinetics and thermodynamics analyses indicate that the electrosorption of NaCl onto CNTs-CNFs electrodes follows first-order kinetics model and is driven by a physisorption process. © 2009 Elsevier B.V. All rights reserved.


Zhang Z.,Engineering Research Center for Nanophotonics and Advanced Instrument | He P.,Engineering Research Center for Nanophotonics and Advanced Instrument | Sun Z.,Engineering Research Center for Nanophotonics and Advanced Instrument | Feng T.,Engineering Research Center for Nanophotonics and Advanced Instrument | And 3 more authors.
Applied Surface Science | Year: 2010

Coiled carbon nanostructure (CNS) is prepared by a catalytic chemical vapor deposition (CVD) process on copper/chromium films deposited by radio frequency (RF) sputtering. Uniform CNS with coiled structure is fabricated by changing the size of the catalyst particles. The effects of Cu catalyst size and RF sputtering power, on the growth of the coiled CNS are discussed, and the results importantly conclude that Cu-catalyzed CVD offers a preferable control of coiled CNS to optimize the field emission property for application. © 2009 Elsevier B.V. All rights reserved.


Qian M.,Engineering Research Center for Nanophotonics and Advanced Instrument | Feng T.,Engineering Research Center for Nanophotonics and Advanced Instrument | Wang K.,Engineering Research Center for Nanophotonics and Advanced Instrument | Ding H.,Engineering Research Center for Nanophotonics and Advanced Instrument | And 2 more authors.
Applied Surface Science | Year: 2010

A comprehensive comparative study of electron field emission properties of carbon nanotube (CNT) films prepared by vacuum filtration and screen-printing was carried out. Field emission performance of vacuum filtered CNT films with different filtered CNT suspension volumes was systematically studied, and the optimum electron emission was obtained with a low turn on field of ∼0.93 V/μm (at 1 μA/cm2) and a high field enhancement factor β of ∼9720. Comparing with screen-printed CNT films, vacuum filtered CNT films showed better electron emission performance, longer lifetime, and greater adhesive strength to substrates. This work reveals a potential use of vacuum filtered CNT films as field emission cathodes. © 2010 Elsevier B.V. All rights reserved.


Cheng Z.,Engineering Research Center for Nanophotonics and Advanced Instrument | Su F.,Engineering Research Center for Nanophotonics and Advanced Instrument | Pan L.,Engineering Research Center for Nanophotonics and Advanced Instrument | Cao M.,Engineering Research Center for Nanophotonics and Advanced Instrument | Sun Z.,Engineering Research Center for Nanophotonics and Advanced Instrument
Journal of Alloys and Compounds | Year: 2010

In this study, CdS quantum dot (QD)-embedded silica films have been prepared by sol-gel method and employed as luminescent down-shifting layer on the front side of a crystalline Si solar cell to improve its performance. Measurements under standard test conditions (AM1.5, 100 mW/cm2) show that the short-circuit current of Si solar cell with silica film containing CdS QDs is improved maximally 4.0% as compared to the one with pure glass. © 2010.

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