Search results for: S.P. Lau

Items from 1 to 20 out of 101 results

article

Anatomical study of the dorsal cutaneous branch of the ulnar nerve (DCBUN) and its clinical relevance in TFCC repair

A.R. Poublon, G. Kraan, S.P. Lau, A.L.A. Kerver, more

Journal of Plastic, Reconstructive & Aesthetic Surgery > 2016 > 69 > 7 > 983-987

The aim of this study was to define a detailed description of the dorsal cutaneous branch of the ulnar nerve (DCBUN) in particular in relevance to triangular fibrocartilage complex (TFCC) repairs.In 20 formalin-embalmed arms, the DCBUN was dissected, and the course in each arm was mapped and categorized. Furthermore, the point of origin of the DCBUN, that is, from the ulnar nerve in association with...

chapter

Growth of epitaxial quality SnS thin films on graphene

W. Wang, K.K. Leung, W.K. Fong, S.F. Wang, more

2012 IEEE International Conference on Electron Devices and Solid State Circuit (EDSSC) > 1 - 3

2012 IEEE International Conference of Electron Devices and Solid-State Circuits (EDSSC)

SnS van der Waals epitaxies (vdWEs) were grown by molecular beam epitaxy (MBE) on layered substrates such as graphene and mica. Photo-absorption measurements indicate an indirect bandgap of ∼1 eV and a direct bandgap of ∼1.25 eV. The technique leads to significant improvement in the crystallinity of the films compared to the samples deposited on convention crystalline semiconductors or soda lime glass...

article

Microfluidic flow direction control using continuous-wave laser

A.Q. Jian, K. Zhang, Y. Wang, S.P. Lau, more

Sensors & Actuators: A. Physical > 2012 > 188 > Complete > 329-334

This paper describes a selective control of the flow direction in microfluidic chips using a laser induced thermal bubble. The bubble is generated inside the microchannel by focusing a continuous-wave laser onto the tear-drop shaped metal pad underneath the microchannel. Experiments demonstrate that the unidirectionally growing bubble acts as an in-channel directional micro-pump and can drive the...

chapter

Application of a graphene buffer layer for the growth of high quality SnS films on GaAs(100) substrate

W. Wang, K.K. Leung, W.K. Fong, S.F. Wang, more

2012 38th IEEE Photovoltaic Specialists Conference > 2614 - 2616

2012 IEEE 38th Photovoltaic Specialists Conference (PVSC)

Tin mono-sulfide (SnS) thin films have been grown by molecular beam epitaxy (MBE) on two different substrates, GaAs (100) and soda lime glass at 400°C. High resolution X-ray Diffraction (HXRD) and Scanning Electron Microscopy (SEM) are used to characterize the structural properties of the as grown SnS films. By introducing a graphene buffer layer between the SnS thin film and the substrate, the XRD...

article

Ferromagnetic anisotropy of carbon-doped ZnO nanoneedles fabricated by ion beam technique

C.S. Wei, S.P. Lau, M. Tanemura, M. Subramanian, more

Applied Surface Science > 2012 > 258 > 14 > 5486-5489

Carbon-doped ZnO (ZnO:C) nanoneedles were fabricated using ion beam irradiation with a simultaneous supply of carbon at room temperature. The structure and the magnetic properties of the ZnO:C nanoneedles were investigated. Hysteresis loops and zero-field cooling (ZFC) and field cooling (FC) curves demonstrated the ferromagnetic properties of the ZnO:C nanoneedles. The Curie temperature of the ZnO:C...

article

Optical and ferromagnetic characteristics of Mn doped ZnO thin films grown by filtered cathodic vacuum arc technique

H.K. Liang, S.F. Yu, S.P. Lau, T.S. Herng, more

Thin Solid Films > 2010 > 518 > 23 > 7048-7052

Mn doped ZnO (ZnO:Mn) thin films with ~10at.% of Mn were grown on quartz substrates by filtered cathodic vacuum arc (FCVA) technique at low substrate temperature (≤200°C). The influence of substrate temperature and oxygen flow rate on the optical, electrical and magnetic properties of the ZnO:Mn thin films was studied. Both room temperature ferromagnetism and ultraviolet photoluminescence were observed...

chapter

Ferromagnetic carbon-doped ZnO nanoneedles

S.P. Lau, T.S. Herng, C.Q. Wei, M. Tanemura

2010 3rd International Nanoelectronics Conference (INEC) > 1118 - 1119

2010 IEEE 3rd International Nanoelectronics Conference (INEC 2010)

Carbon doped ZnO (ZnO:C) nanoneedles exhibiting Curie temperature above room temperature were fabricated using ion beam technique. The structural and magnetic properties of the ZnO:C nanoneedles were studied. The magnetic moment of the ZnO:C nanoneedles was found to be around 0.7 ??_B per carbon atom. The ZnO:C nanoneedles could be a promising intrinsic diluted magnetic semiconductor.

chapter

Intense photoluminescence emission from amorphous indium oxynitride thin films by filtered cathodic vacuum arc technique

X.H. Ji, S.P. Lau, Q.Y. Zhang

2009 14th OptoElectronics and Communications Conference > 1 - 2

2009 35th European Conference on Optical Communication (ECOC)

Intense photoluminescence centered at around 1.3 eV has been observed from amorphous InNxOy films, and a slightly blue-shift of PL at 77 K in comparison with that of 300 K has been detected.

article

Suppression of Random Lasing Modes in Polycrystalline ZnO Thin-Film by Using Distributed Bragg Reflector

S.H. Tsang, S.F. Yu, S.P. Lau, H.Y. Yang, more

IEEE Photonics Technology Letters > 2009 > 21 > 8 > 549 - 551

Formation of vertical-cavity random laser by using a polycrystalline ZnO thin-film optically coupled to 11.5 pairs of Al₂O₃-ZnO multilayer distributed Bragg reflector (DBR) is proposed. Lasing characteristics of the laser observed from the surface of the polycrystalline ZnO thin film are studied without and with the presence of DBR. It is found that the corresponding spectral linewidth can be limited...

article

Carbon nanofibers and multiwalled carbon nanotubes from camphor and their field electron emission

Savita P. Somani, Prakash R. Somani, M. Tanemura, S.P. Lau, more

Current Applied Physics > 2009 > 9 > 1 > 144-150

Vertically aligned carbon nanofibers (CNF) and multiwalled carbon nanotubes (MWCN) have been synthesized from camphor by catalytic thermal CVD method on Co and Co/Fe thin films (for CNF) and on silicon substrates using a mixture of camphor and ferrocene (for MWCN). CNF and MWCN are studied by field emission scanning electron microscopy, high-resolution transmission electron microscopy, visible Raman...

article

Multi-purpose ionization gas sensing devices using carbon nanofibers on plastic substrates

H.S. Sim, S.P. Lau, L.K. Ang, M. Tanemura, more

Diamond & Related Materials > 2008 > 17 > 11 > 1959-1962

The authors present the study of carbon-nanofiber-based (CNF) ionization gas sensing devices on plastic substrates. The device is configured as diode structure with a Cu plate and a CNF film as anode and cathode respectively. The lowest breakdown voltage for He, Ar, air, N ₂ , N ₂ O, O ₂ and C ₂ H ₂ is 215, 270, 400, 490, 540, 574 and 613 V with 5% of variations,...

article

Field electron emission of multiwalled carbon nanotubes and carbon nanofibers grown from Camphor

Savita P. Somani, Prakash R. Somani, A. Yoshida, M. Tanemura, more

Solid State Electronics > 2008 > 52 > 6 > 941-945

Vertically aligned carbon nanofibers (CNF) and multiwalled carbon nanotubes (MWCN) were synthesized from camphor by catalytic thermal chemical vapor deposition on Co and Co/Fe thin films (for CNF) and on silicon substrates using a mixture of camphor and ferrocene (for MWCN). CNF and MWCN were studied by scanning and transmission electron microscopy, visible Raman spectroscopy, X-ray diffraction in...

chapter

Synthesis, optical properties and functional applications of ZnO nano-materials: A review

S. Tanemura, L. Miao, M. Tanemura, F.Y. Ran, more

2008 2nd IEEE International Nanoelectronics Conference > 58 - 63

2008 2nd IEEE International Nanoelectronics Conference (NEC)

This review article summarizes briefly some important achievements of our recent research on the synthesis, optical properties and novel applications of nano-structured ZnO such as nanorods and honeycomb shaped 3-D (dimension) nano random-walls. A chemical reaction/vapor transportation deposition technique was employed to fabricate those structures on ZnO/SiO₂/Si substrate without any catalyst and...

chapter

Magnetic properties and photoluminescence of undoped and transition metal doped A1N nanorods

X.H. Ji, S.P. Lau, S.F. Yu, T.S. Herng, more

2008 2nd IEEE International Nanoelectronics Conference > 206 - 209

2008 2nd IEEE International Nanoelectronics Conference (NEC)

The undoped and transition metal (TM) -doped AIN (AIN:Cu and AIN:Fe) nanorods on silicon substrates were fabricated using a catalysis-free vapor phase method. All the nanorods exhibited high crystalline quality and preferred c-axis orientation. Room-temperature photoluminescence (PL) measurement revealed that undoped AIN nanorods exhibited strong oxygen-related impurity emission at ~3.25 eV. However,...

article

Low-temperature fabrication and random laser action of doped zinc oxide nanoneedles

Masaki Tanemura, H. Hatano, M. Kudo, N. Ide, more

Surface Science > 2007 > 601 > 18 > 4459-4464

Zinc oxide (ZnO) thin films grown on SiO ₂ -coated Si substrates by filtered cathodic vacuum arc (FCVA) at 200°C was irradiated with Ar ⁺ ions with a simultaneous supply of Fe atoms or with N2+ ions (without Fe) at room temperature to fabricate Fe- or N-doped ZnO nanoneedles, respectively. The morphological structure of the doped nanoneedles was almost identical with that of non-doped...

article

Zn-interstitial-enhanced ferromagnetism in Cu-doped ZnO films

T.S. Herng, S.P. Lau, S.F. Yu, J.S. Chen, more

Journal of Magnetism and Magnetic Materials > 2007 > 315 > 2 > 107-110

Copper-doped ZnO (ZnO:Cu) films exhibiting room-temperature (RT) ferromagnetism were prepared by filtered cathodic vacuum arc (FCVA) technique. The ZnO:Cu films deposited at RT showed the strongest magnetic moment of 0.40μ _B /Cu as compared with the samples prepared at elevated temperatures. The observed strong ferromagnetism in the RT-deposited ZnO:Cu films could be partly associated with...

article

Synthesis, morphology and random laser action of ZnO nanostructures

L. Miao, S. Tanemura, Y. Ieda, M. Tanemura, more

Surface Science > 2007 > 601 > 13 > 2660-2663

Three-dimensional (3-D) ZnO random-wall nanostructures and one-dimensional (1-D) ZnO nanorods were prepared on silicon substrates by a simple solid–vapour phase thermal sublimation technique. Optical pumped random lasing has been observed in the ZnO random-wall arrays with a threshold intensity of 0.38MW/cm ² in the emission wavelength from 380 to 395nm. The optical gain was attributed to...

article

Field electron emission of double walled carbon nanotube film prepared by drop casting method

Prakash R. Somani, Savita P. Somani, S.P. Lau, E. Flahaut, more

Solid State Electronics > 2007 > 51 > 5 > 788-792

Thick films of double walled carbon nanotubes (DWCN) were deposited on indium-tin-oxide (ITO) coated glass substrates by drop casting method and were studied for their field electron emission property in a parallel plate configuration using bare ITO coated glass as counter electrode. They show excellent field electron emission property with low turn-on-field of about 0.8V/μm and threshold field of...

article

Structural and optical properties of wurtzite InN grown on Si(111)

X.H. Ji, S.P. Lau, H.Y. Yang, Q.Y. Zhang

Thin Solid Films > 2007 > 515 > 11 > 4619-4623

We report the structural and optical properties of InN films on Si(111) prepared by ion-beam-assisted filtered cathodic vacuum arc technique. X-ray diffraction and Raman spectroscopy measurements indicated that all the InN films were hexagonal crystalline InN. The InN films deposited at substrate temperature of 475 °C exhibited highly (0001) preferred orientation and texturing (cratered) surface morphology...

article

Edge-Emitting Vertically Aligned ZnO Nanorods Random Laser on Plastic Substrate

E.S.P. Leong, S.F. Yu, S.P. Lau, A.P. Abiyasa

IEEE Photonics Technology Letters > 2007 > 19 > 22 > 1792 - 1794

Random laser action with in-plane coherent feedback has been realized in vertically aligned ZnO nanorods on plastic substrate. A polycarbonate substrate coated with a thin layer of ZnO template was used to grow the nanorods by an aqueous chemical method. It can be shown that there are some restrictions on the dimensions of the ZnO template and nanorods that can be used to achieve in-plane random lasing...

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Search results for: S.P. Lau

Anatomical study of the dorsal cutaneous branch of the ulnar nerve (DCBUN) and its clinical relevance in TFCC repair

Growth of epitaxial quality SnS thin films on graphene

Microfluidic flow direction control using continuous-wave laser

Application of a graphene buffer layer for the growth of high quality SnS films on GaAs(100) substrate

Ferromagnetic anisotropy of carbon-doped ZnO nanoneedles fabricated by ion beam technique

Optical and ferromagnetic characteristics of Mn doped ZnO thin films grown by filtered cathodic vacuum arc technique

Ferromagnetic carbon-doped ZnO nanoneedles

Intense photoluminescence emission from amorphous indium oxynitride thin films by filtered cathodic vacuum arc technique

Suppression of Random Lasing Modes in Polycrystalline ZnO Thin-Film by Using Distributed Bragg Reflector

Carbon nanofibers and multiwalled carbon nanotubes from camphor and their field electron emission

Multi-purpose ionization gas sensing devices using carbon nanofibers on plastic substrates

Field electron emission of multiwalled carbon nanotubes and carbon nanofibers grown from Camphor

Synthesis, optical properties and functional applications of ZnO nano-materials: A review

Magnetic properties and photoluminescence of undoped and transition metal doped A1N nanorods

Low-temperature fabrication and random laser action of doped zinc oxide nanoneedles

Zn-interstitial-enhanced ferromagnetism in Cu-doped ZnO films

Synthesis, morphology and random laser action of ZnO nanostructures

Field electron emission of double walled carbon nanotube film prepared by drop casting method

Structural and optical properties of wurtzite InN grown on Si(111)

Edge-Emitting Vertically Aligned ZnO Nanorods Random Laser on Plastic Substrate

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