APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

15 Jan 2007

Volume 90, Issue 3, Articles (03xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 90, 032108 (2007); http://dx.doi.org/10.1063/1.2431702 (3 pages)

D. Buca, B. Holländer, S. Feste, St. Lenk, H. Trinkaus, S. Mantl, R. Loo, and M. Caymax
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Nanoimprint of gratings on a bulk metallic glass

J. P. Chu, H. Wijaya, C. W. Wu, T. R. Tsai, C. S. Wei, T. G. Nieh, and Jeffrey Wadsworth

Appl. Phys. Lett. 90, 034101 (2007); http://dx.doi.org/10.1063/1.2431710 (3 pages) | Cited 33 times

Online Publication Date: 17 January 2007

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The authors demonstrate that optical gratings with 600 and 1500 nm periods on a Pd40Ni40P20 bulk metallic glass (BMG) can be faithfully imprinted in air from Si dies. Results of scanning electron microscopy, atomic force microscopy, and optical diffraction analysis show the fine line feature of ∼ 150 nm. The gratings have smooth and uniform surface profiles with comparable optical properties as the original Si dies. The BMG gratings can be further used to imprint the second-generation replicas on polymethylmethacrylate. Thereby, BMG is a suitable material not only for imprinting nanostructured parts such as gratings, but also as a good die material for nanoimprints.
Show PACS
42.79.Dj Gratings
81.16.Nd Micro- and nanolithography
42.82.Cr Fabrication techniques; lithography, pattern transfer
68.37.Hk Scanning electron microscopy (SEM) (including EBIC)
68.35.B- Structure of clean surfaces (and surface reconstruction)
68.37.Ps Atomic force microscopy (AFM)
61.43.Fs Glasses

Shaping high-speed Marangoni flow in liquid films by microscale perturbations in surface temperature

Amar S. Basu and Yogesh B. Gianchandani

Appl. Phys. Lett. 90, 034102 (2007); http://dx.doi.org/10.1063/1.2430777 (3 pages) | Cited 14 times

Online Publication Date: 18 January 2007

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The authors show that a variety of controlled flow patterns, including toroidal cells and surface doublets, can be generated in 80–400 μm thick liquid films by placing scanning microscopy probes with integrated heaters just above the surface (<400 μm separation). The probes project sharp temperature gradients on the liquid surface which drive Marangoni flow. Flow velocities approaching 3000 μm/s are experimentally demonstrated on length scales of 20–200 μm with <20 mW input power. For liquids such as water and oil, in which the surface tension coefficient is ≈ 0.2 mN/m K, flows >1000 μm/s can be accomplished with surface temperature perturbations <1 °C. This technique enables microfluidic manipulation on unpatterned substrates.
Show PACS
68.15.+e Liquid thin films
68.03.Cd Surface tension and related phenomena
47.61.-k Micro- and nano- scale flow phenomena
44.25.+f Natural convection

Band gap tuning of lead-substituted BaSnO3 for visible light photocatalysis

Pramod H. Borse, Upendra A. Joshi, Sang Min Ji, Jum Suk Jang, Jae Sung Lee, Euh Duck Jeong, and Hyun Gyu Kim

Appl. Phys. Lett. 90, 034103 (2007); http://dx.doi.org/10.1063/1.2430932 (3 pages) | Cited 16 times

Online Publication Date: 18 January 2007

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The Pb substitution effect was investigated experimentally and theoretically on the crystal structure of BaSnO3 and on the photo-oxidation activity of H2O. The chemically doped Pb in BaSnO3 induced a concentration-dependent redshift of the experimental band gap (BG). The BaPb0.8Sn0.2O3 system produced 32 μmol/h of O2 under λ ≥ 420 nm photons, but no O2 for BaSnO3. The DFT calculations of BaPbxSn1−xO3 (x = 0,0.5,1) by using generalized approximation, implying the BG alteration and the photocatalytic activity of BaPbxSn1−xO3, are due to the induced Pb 6s orbital in the BG of BaSnO3. Thus Pb modified the insulating nature of BaSnO3 to semiconducting and semimetallic.
Show PACS
61.66.Fn Inorganic compounds
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
78.40.Ha Other nonmetallic inorganics

Capacitance spectroscopy of amorphous/crystalline silicon heterojunction solar cells at forward bias and under illumination

A. S. Gudovskikh and J. P. Kleider

Appl. Phys. Lett. 90, 034104 (2007); http://dx.doi.org/10.1063/1.2431783 (3 pages) | Cited 5 times

Online Publication Date: 18 January 2007

Full Text: Read Online (HTML) | Download PDF

Show Abstract
An original method of characterization of interface properties of hydrogenated amorphous silicon/crystalline silicon heterojunction solar cells is proposed. This is based on the measurement of the capacitance under AM1.5 illumination at forward bias close to the open-circuit voltage. The capacitance is very sensitive to the quality of both the front heterojunction and the back contact. The authors show that the comparison of the low-frequency capacitance with the open-circuit voltage can be used to deduce both the back surface recombination velocity of minority carriers and the front interface defect density. The technique can be applied to other types of solar cells.
Show PACS
84.60.Jt Photoelectric conversion
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping

Experimental results from sea trials of an offshore wave energy system

R. Waters, M. Stålberg, O. Danielsson, O. Svensson, S. Gustafsson, E. Strömstedt, M. Eriksson, J. Sundberg, and M. Leijon

Appl. Phys. Lett. 90, 034105 (2007); http://dx.doi.org/10.1063/1.2432168 (3 pages) | Cited 21 times

Online Publication Date: 18 January 2007

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A full-scale prototype of a wave power plant has been installed off the Swedish west coast and the overall wave energy converter concept has been verified. Initial results have been collected and significant insights discovered. Energy absorption dependency on load as well as output voltage and power is demonstrated. It is shown that great overload capability of the directly driven linear generator is critical, and indicated that, for resistive loads, optimal load does not vary with wave climate. Future grid supplying energy production would necessitate parks of wave power plants in order to reduce power fluctuations.
Show PACS
84.70.+p High-current and high-voltage technology: power systems; power transmission lines and cables
84.50.+d Electric motors

Improved hydrogen storage properties of LiBH4 destabilized by carbon

X. B. Yu, Z. Wu, Q. R. Chen, Z. L. Li, B. C. Weng, and T. S. Huang

Appl. Phys. Lett. 90, 034106 (2007); http://dx.doi.org/10.1063/1.2432240 (3 pages) | Cited 52 times

Online Publication Date: 18 January 2007

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The hydrogen storage properties of LiBH4 ball milled with various ratios of carbon nanotubes (Cnano) were investigated. The LiBH4/Cnano mixtures showed superior dehydrogenation, hydrogen desorption starting at 250 °C, and the majority of hydrogen being released below 600 °C. The rehydrogenation results revealed that the Li2C2, formed during the dehydrogenation, could be reversed to LiH, in which the hydrogen capacity corresponds to 1/4 of the original hydrogen content of LiBH4, and C at 10 MPa hydrogen pressure and 400 °C.
Show PACS
84.60.-h Direct energy conversion and storage

Fabrication and characterization of red-emitting electroluminescent devices based on thiol-stabilized semiconductor nanocrystals

Cristina Bertoni, Diego Gallardo, Steve Dunn, Nikolai Gaponik, and Alexander Eychmüller

Appl. Phys. Lett. 90, 034107 (2007); http://dx.doi.org/10.1063/1.2433030 (3 pages) | Cited 36 times

Online Publication Date: 19 January 2007

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Thiol-capped CdTe nanocrystals were used to fabricate light-emitting diodes, consisting of an emissive nanocrystal multilayer deposited layer by layer, sandwiched between indium tin oxide and aluminum electrodes. The emissive and electrical properties of devices with different numbers of nanocrystal layers were studied. The improved structural homogeneity of the nanocrystal multilayer allowed for stable and repeatable current- and electroluminescence-voltage characteristics. These indicate that both current and electroluminescence are electric-field dependent. Devices were operated under ambient conditions and a clear red light was detected. The best performing device shows a peak external efficiency of 0.51% and was measured at 0.35 mA/cm2 and 3.3 V.
Show PACS
85.60.Jb Light-emitting devices

Towards a generalized representation of surface effects on pressure-driven liquid flow in microchannels

Suman Chakraborty

Appl. Phys. Lett. 90, 034108 (2007); http://dx.doi.org/10.1063/1.2433037 (3 pages) | Cited 17 times

Online Publication Date: 19 January 2007

Full Text: Read Online (HTML) | Download PDF

Show Abstract
This letter postulates a generalized fundamental formulation to model the influence of surface characteristics on pressure-driven liquid transport through microchannels. Probabilistic effects pertaining to the influence of roughness elements and uncertainties in wall conditions due to the presence of a random distribution of nanobubbles are represented spectrally by employing a stochastic version of the Navier-Stokes equations. A generalized mathematical expression is eventually arrived at, by normalizing these characteristics, which can act as a fundamental scientific guideline towards the design of microfluidic channels.
Show PACS
47.85.Np Fluidics
47.61.Fg Flows in micro-electromechanical systems (MEMS) and nano-electromechanical systems (NEMS)
47.60.-i Flow phenomena in quasi-one-dimensional systems
47.61.Jd Multiphase flows
47.55.dd Bubble dynamics
47.10.ad Navier-Stokes equations
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close