Yang Wang

Harbin Institute of Technology, Charbin, Heilongjiang Sheng, China

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Publications (84)48.7 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The miniaturization of electronics devices into the nanometer scale is indispensable for next-generation semiconductor technology, and carbon nanotubes are considered to be the promising candidates for the future interconnection wires. To study the carbon nanotubes interconnection during nanowelding, we propose the new nanospot welding method using near-field enhancement effect of the metallic AFM probe irradiated by optical fiber probe laser. Based on theoretically analyzing the near-field enhancement effect, we set up the experimental system for nanospot welding with good interconnection results of silver nanoparticles and carbon nanotubes, not only proving that the interconnection operation of CNTs can be effectively achieved by the thermal AFM probe tip irradiated by optical fiber probe laser, but also providing a promising technical approach for nanospot welding.
    RSC Advances 06/2015; 5(70). DOI:10.1039/C4RA10117K · 3.84 Impact Factor
  • Li Jun Yang · Bai Cheng · Yang Wang
    Key Engineering Materials 05/2015; 645-646:1054-1058. DOI:10.4028/www.scientific.net/KEM.645-646.1054 · 0.19 Impact Factor
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    ABSTRACT: With the development of nanoscience and nanotechnology, as the bottom-up nanofabrication of nanostructures formed by polystyrene nanoparticles, joining technology is an essential step for the manufacturing and assembly of nanodevices and nanosturctures in order to provide mechanical integration and connection, etc. To study nanospot welding of polystyrene nanoparticles, we propose the new nanospot soldering method using near-field enhancement effect of the metallic AFM probe tip irradiated by optical fiber probe laser. Based on theoretically analyzing the near-field enhancement effect, we set up the experimental system for nanospot soldering. And this approach is illustrated by using optical fiber probe laser irradiating the AFM probe tip to sinter the nanoparticles, providing a promising technical approach for nanosoldering application in nanoscience and nanotechnology.
    ACS Applied Materials & Interfaces 01/2015; 7(4). DOI:10.1021/am506344j · 6.72 Impact Factor
  • Junyan Liu · Jinlong Gong · Lei Qin · Yang Wang
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    ABSTRACT: A simple theoretical expression is described to demonstrate the thermal response characteristics of the thermal wave field in the frequency domain by means of the Green’s function method. The defect detectivity using lock-in thermography (LIT) for a carbon-fiber-reinforced polymer (CFRP) with a subsurface defect is investigated, and theoretical analysis results of the defect depth resolution as well as the detection range determined by the thermal wave phase information have shown good agreement with experimental results. The detectable size of a lamination defect in a CFRP has also been studied using lock-in thermographic imaging. The experimental results indicate that LIT is reliably available for evaluating subsurface defects of a CFRP panel at the appropriate modulation frequency, and the defect diameter-to-depth ratio can be as low as 3.0.
    International Journal of Thermophysics 01/2015; DOI:10.1007/s10765-015-1874-7 · 0.96 Impact Factor
  • 12/2014; 711:222-226. DOI:10.4028/www.scientific.net/AMM.711.222
  • Key Engineering Materials 08/2014; 621:94-100. DOI:10.4028/www.scientific.net/KEM.621.94 · 0.19 Impact Factor
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    ABSTRACT: In order to solve the problem that delamination and bur will be easily produced in the process of the carbon fiber reinforced plastic (CFRP) composites, the cutting experiment of CFRP machined by pulsed Nd:YAG laser has been carried out. In the meantime, this paper investigates the mechanism of interaction between infrared laser and CFRP composite material and the quality of kerf influenced by different laser parameters and cutting directions. The study found that choosing appropriate laser parameters and cutting direction are effective means to get smaller heat affected zone (HAZ). This paper analysis the cross section morphology of kerf .The results show that the cross section does not appear stratified phenomenon and the surface is smooth, so the feasibility that infrared laser can be used to cut CFRP composites is verified.
    Materials Science Forum 07/2014; 800-801:832-837. DOI:10.4028/www.scientific.net/MSF.800-801.832
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    ABSTRACT: The combined-dynamic mode DPN (CDDPN), rather than mostly used contact mode DPN or tapping mode DPN, becomes the important tool for the creation of nanodots with the direct-writing method of depositing the ink onto the substrate surface at the predetermined position. However, successful examples of using CDDPN to fabricate nanodots are relatively few, and the formation process and the size of nanodots are affected by various factors, such as humidity, substrate material, contact time and surface roughness. So the influences of various factors on nanodots are explored through the experimental method. The results are that the nanodots become larger with the increase of the relative humidity and the roughness of the surface, respectively; similarly, the nanodot is created easily on the soft surface with hydrophilicity in the longer contact time; in addition, for the better nanolithography quality of the nanodot, the nanolithography process, under the optimized influence parameters, is accomplished once without the intermediate scan imaging process as much as possible.
    Integrated Ferroelectrics 05/2014; 151(1):7-13. DOI:10.1080/10584587.2014.898554 · 0.37 Impact Factor
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    ABSTRACT: Dip-pen nanolithography (DPN), based on atomic force microscope (AFM) system, is an effective method for nanoscale science and engineering, and the potential applications of DPN will be shown in the field of nanomechanics, nanomaterials, nanobiotechnology, nanomedicine. And the novel combined-dynamic mode DPN (CDDPN), rather than mostly used contact mode DPN or tapping mode DPN, becomes the important tool for the fabrication of nanodots with the direct-writing method of depositing the ink onto the hard silicon surface at the predetermined position, which is presented in the corresponding experiments. In addition, the size of nanodots gradually decreases in the diameter with the increase of the number of nanodots in the case of AFM tip dipping in ink once. However, the size in height does not monotonically reduce as the reduction of the ink, which is affected by the interaction among the relative humidity, AFM tip, substrate material, surface roughness, etc. For the better nanolithography quality of the nanodot, the nanolithography process, under the optimized process parameters, is accomplished once without the intermediate scan imaging process as much as possible.
    Key Engineering Materials 04/2014; 609-610:191-195. DOI:10.4028/www.scientific.net/KEM.609-610.191 · 0.19 Impact Factor
  • Jianlei Cui · Lijun Yang · Yang Wang
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    ABSTRACT: Dip-pen nanolithography (DPN), based on atomic force microscope (AFM) system, is an effective method for nanoscale science and engineering and the potential applications of DPN feature in the fields of nanomechanics, nanomaterials, nanobiotechnology and nanomedicine and combined dynamic mode DPN, rather than the often used contact mode DPN or the tapping mode DPN, becomes an important tool for the creation of nanodots with the direct writing method of depositing the ink onto the hard silicon surface at the predetermined position with a very high resolution, which is presented in the corresponding experiments. For a better nanolithography quality of the nanodot, the nanolithography process, under the optimised process parameters, is accomplished once without the intermediate scan imaging process as much as possible. In addition, the size of the nanodots subsequently decreases with the increase of the number of the nanodots in the case of the AFM tip dipping in ink once. Consequently, for the creation of a nanodot within the controllable mass, the measurement scheme about the deposition mass of ink, theoretically analysed and experimentally achieved in the aspect of quantification, is also proposed in this Letter.
    Micro & Nano Letters 03/2014; 9(3):189-192. DOI:10.1049/mnl.2014.0030 · 0.80 Impact Factor
  • Jianlei Cui · Lijun Yang · Yang Wang
    RARE METAL MATERIALS AND ENGINEERING 02/2014; 43(2):369-374. · 0.15 Impact Factor
  • Jianlei Cui · Lijun Yang · Yang Wang
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    ABSTRACT: The miniaturization of electronics devices into the nanometer scale is indispensable for next-generation semi-conductor technology. In order to study the carbon nanotubes connection during nanosoldering, the melting process of nanosolder and nanosoldering process between single-walled carbon nanotubes are considered with molecular dynamics simulations. As the simulation results, the melting point of 2nm silver solder is about 605K below the melting temperature of Ag bulk material due to high surface energy. By modeling the SWNTs with different chiral indices, Ag atoms may be dragged into the nanotubes to form different connection configuration which has no relationship with chirality of SWNTs. The length of core filling nanowires structure does not become longer with the increasing diameter of SWNT and have the relationship with the diameter, the dominant mechanism of which is also analyzed. In addition, as the heating temperature and time respectively increases, more Ag atoms can enter the SWNTs with longer length of Ag nanowires to achieve the connection between nanosolder and SWNTs, and less Ag atoms can remain in the gap between SWNT and SWNT with the tight atomic structures due to strong metal bonds for the connection between nanosolder and Si substrate.
    ACS Applied Materials & Interfaces 01/2014; 6(3). DOI:10.1021/am405114n · 6.72 Impact Factor
  • Hai-jun Gong · Mao-lu Wang · Yang Wang
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    ABSTRACT: Surface hardness value is a commonly used indicator for describing the mechanical property of stereolithography parts. In order to investigate colorants how to influence the surface hardness of colorful resin component, a procedure is proposed to fabricate testing specimens based on color stereolithography technology in this study. Liquid photosensitive resin LPR2001 is mixed with two colorants (phthalocyanine blue and eosin powder) respectively before curing. The phthalocyanine blue powder is insoluble and only dispersive in the solid-liquid mixture which results in deposits. Therefore, surface modification is conducted to the phthalocyanine blue powder for improving wettability. By contrast, the eosin powder is dissoluble and does not cause any deposits in the liquid resin. Specimens are produced by laser curing colored resin and tested by MTSR Nano Indenter XP system. The change of hardness values is illustrated at certain mass percentages of colorant. Comparisons and discussions are carried out to explain the colorants’ effect. It is concluded that incorporating colorant to liquid resin results in decreasing the surface hardness of components. But sensibilization effect of the colorants also influences the curing process. Surface modification to the phthalocyanine blue powder is a feasible method to increase the hardness value of color stereolithography components. Dissolvable eosin has an approximate linear effect on surface hardness.
    Journal of Shanghai Jiaotong University (Science) 12/2013; 18(6):738-741. DOI:10.1007/s12204-013-1459-1
  • Junyan Liu · Jinlong Gong · Liqiang Liu · Lei Qin · Yang Wang
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    ABSTRACT: In this paper, the thermoelastic stress analysis (TSA) on a multilayered composite structure (MCS) was investigated by means of lock-in thermographic image technique (LITI). The application of thermoelastic stress analysis on MCS becomes particularly complicated due to consisting of different material components, which determines the different thermoelastic coupling response depended on material thermal-physical property. The thermoelastic coupling constants (TCC) of GFRP, medium-carbon steel and foam were obtained through thermomechanical calibration experiments, respectively. An artificial neural network was proposed to determine the component of MCS. Comparisons between finite element analysis (FEA) and LITI measurement are reported. It is found that the stress distribution of MCS can be evaluated with good accuracies using LITI measurement.
    Infrared Physics & Technology 11/2013; 61:134–143. DOI:10.1016/j.infrared.2013.08.004 · 1.46 Impact Factor
  • Jianlei Cui · Lijun Yang · Yang Wang
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    ABSTRACT: The miniaturization of electronics devices into the nanometer scale is indispensable for next-generation semi-conductor technology. However, the determination of interconnect structures of carbon nanotubes (CNTs) is difficult to do experimentally in nanosoldering process and the investigation of dynamic evolution between CNTs is still lacking during nanoscale soldering. So, the nanoscale soldering of positioned single-walled carbon nanotubes with "T-", "Y-"and "X-" junction is proposed and demonstrated with molecular dynamics simulation. As the simulation results, when the number of the deposited nanoparticles is small, the nanoscale soldering processes of "T-" and "Y-" junction are accomplished through the silver nanoparticles melting and bunching up in a larger droplet due to its higher surface energy. With the increase of simulation time, the splitting phenomenon of nano-droplet exists in the interconnection configuration. However, when the number of the deposited nanoparticles is large, the nano-mound can completely wrap the crossed X-junction without splitting phenomenon. Furthermore, the dominant mechanism of the interesting phenomenon is also analyzed.
    Applied Surface Science 11/2013; 284:392-396. DOI:10.1016/j.apsusc.2013.07.110 · 2.54 Impact Factor
  • Xue Feng Wu · Teng Fei Gao · Yang Wang
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    ABSTRACT: Theoretical, experimental and simulation researches are investigated to study the phenomenon of edge chipping in laser assisted milling (LAML) of silicon nitride ceramics. To consider the crack evolution and influencing factors of edge chipping, the Extended Finite Element Method (XFEM) is used to model the process of chipping crack with the advantage of independent of the mesh and needless to remesh with the crack growth. The chipping width measured from experiments are loaded as initial boundary conditions to build the XFEM model, and the results show the edge chipping reduces with cutting forces decreasing and edge toughness increasing. The model reveals the edge chipping of workpiece reduces at elevated temperature through softening and toughening mechanisms.
    Key Engineering Materials 10/2013; 589-590:511-516. DOI:10.4028/www.scientific.net/KEM.589-590.511 · 0.19 Impact Factor
  • Jianlei Cui · Lijun Yang · Yang Wang
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    ABSTRACT: A systematic study of near-field enhancement on a laser-irradiated atomic force microscope (AFM) metal probe is reported. The dependence of the electric field distribution on various parameters, like laser wavelength, tip curvature radius, half taper angle and tip–substrate distance, is numerically studied using the finite element method in this paper. The simulation results show that high field enhancement appears around the tip and is mainly concentrated under the apex of the tip when the incident laser interacts with the AFM metal tip. The results indicate that electric field enhancement easily appears when the AFM metal tip is irradiated by a higher frequency incident laser, with a similar phenomenon using a relatively sharp tip. In addition, as the tip–substrate distance increases, the peak electric field enhancement underneath the apex of the tip decreases. Based on the distribution of electric field enhancement, a new scheme combining an optical fiber probe and an AFM metal probe is proposed for nanolithography.
    Laser Physics 05/2013; 23(7):076003. DOI:10.1088/1054-660X/23/7/076003 · 1.03 Impact Factor
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    ABSTRACT: The pulsed thermographic technique was used to detect flat-bottomed hole defects in SiC coated high-temperature alloy plates. Temperature–time Logarithm Fitting Method (TtLFM), Principal Component Analysis (PCA) and Pulsed Phase Thermography (PPT) were used to extract the characteristic information of the thermal wave signal generated by thermal pulse. It is found that PCA algorithm is available for analyzing the thermal wave signal generated by thermal pulse due to higher signal–noise ratio. Experiments were performed to investigate the effect on the thermal contrast by the pulse intensity, frame rate and analysis moment, respectively. Experimental results show that larger pulse intensity and frame rate are benefit to get larger thermal contrast thermogram, and optimal analysis moment selected is helpful to detect the defects of SiC coated high-temperature alloy plates using pulsed thermographic technique.
    Infrared Physics & Technology 03/2013; 57:21–27. DOI:10.1016/j.infrared.2012.11.007 · 1.46 Impact Factor
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    ABSTRACT: The linear frequency modulated ultrasound excitation thermal wave imaging (LFM-UTWI) was investigated on detection of subsurface defects of metal sheet. A numerical finite element analysis is carried out to calculate thermal wave signal dependence of time by linear frequency modulated ultrasonic wave excitation. Cross-correlation operation in time domain and frequency domain are used to extract the main peak value and the corresponding delay time, respectively. Fourier transform (FT) is applied to calculate the amplitude and phase angle of harmonic component of thermal wave. Experimental results show that various deep subsurface defects are readily detected using LFM-UTWI with once excitation, and LFM-UTWI has an advantage of better defect detectability compared to ultrasound lock-in thermography (ULIT).
    Infrared Physics & Technology 01/2013; 62. DOI:10.1016/j.infrared.2013.11.006 · 1.46 Impact Factor
  • Jinlong Gong · Junyan Liu · Lei Qin · Yang Wang
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    ABSTRACT: A combined theoretical and experimental approach is reported using thermal-wave radar imaging (TRWI) for carbon fiber reinforced polymer (CFRP) with subsurface defects inspection. The multi-transform technique (Fourier transform, FT, Hilbert transform, HT, and cross-correlation, CC) is applied to extract the characteristics of thermal-wave signal. Experimental results indicate that the multi-transform technique of thermal-wave signal is available for detecting the subsurface defect. For the shallow defect (defect depth ≤1 mm), the delay time image of CC exhibits the high contrast, and the phase image of FT has the high SNR at the right frequency component. For the deep defect (defect depth 2.0 mm), the phase images of HT have both the high contrast and the large SNR value.
    NDT & E International 01/2013; 62. DOI:10.1016/j.ndteint.2013.12.006 · 1.72 Impact Factor

Publication Stats

53 Citations
48.70 Total Impact Points

Institutions

  • 2002–2015
    • Harbin Institute of Technology
      • • Department of Mechatronic Engineering
      • • School of Mechanical and Electrical Engineering
      Charbin, Heilongjiang Sheng, China
  • 2012
    • China University of Geosciences (Beijing)
      • Department of Earth Science and Resources
      Peping, Beijing, China