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

20 Oct 2008

Volume 93, Issue 16, Articles (16xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 93, 161101 (2008); http://dx.doi.org/10.1063/1.3000630 (3 pages)

E. Mujagić, L. K. Hoffmann, S. Schartner, M. Nobile, W. Schrenk, M. P. Semtsiv, M. Wienold, W. T. Masselink, and G. Strasser
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Low-temperature synthesis of Si nanowires using multizone chemical vapor deposition methods

Pengfei Qi, William S. Wong, Huaizhou Zhao, and Dunwei Wang

Appl. Phys. Lett. 93, 163101 (2008); http://dx.doi.org/10.1063/1.2999591 (3 pages) | Cited 6 times

Online Publication Date: 20 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
With a multitemperature zone chemical vapor deposition reactor, silicon nanowires (SiNWs) were synthesized at temperatures below the Au–Si eutectic point, with Au nanoparticles as the growth seeds. Nanoparticle seeds with diameters less than 60 nm were used to grow NWs at temperatures below 350 °C. A strong dependence on the growth rate with the synthesis temperature and the size of the Au nanoparticle seeds was observed. With 10 nm particles, SiNWs were reproducibly synthesized at a temperature of 290 °C. We suggest that the governing role for the synthesis lies in the diffusion of Si feeding into the growth seeds.
Show PACS
81.16.-c Methods of micro- and nanofabrication and processing
61.46.Km Structure of nanowires and nanorods (long, free or loosely attached, quantum wires and quantum rods, but not gate-isolated embedded quantum wires)
68.65.La Quantum wires (patterned in quantum wells)
66.30.H- Self-diffusion and ionic conduction in nonmetals
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)

Stabilization of PbSe quantum dots by ultrathin EuTe and SrTe barrier layers

L. Abtin and G. Springholz

Appl. Phys. Lett. 93, 163102 (2008); http://dx.doi.org/10.1063/1.3000386 (3 pages)

Online Publication Date: 20 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Overgrowth of self-assembled quantum dots usually changes their shape and composition due to surface exchange reactions and redistribution of adatoms. As shown for PbSe dots, this can be completely suppressed by covering the dots with ultrathin EuTe or SrTe barrier layers, based on the large EuTe and SrTe binding energies. The model is supported by annealing experiments that show that these barrier layers also suppress the usual coarsening and Ostwald ripening process.
Show PACS
81.16.Dn Self-assembly
61.72.Cc Kinetics of defect formation and annealing

Synthesis and conductance measurement of periodic arrays of gold nanoparticles

Y. Kakefuda, K. Narita, T. Komeda, S. Yoshimoto, and S. Hasegawa

Appl. Phys. Lett. 93, 163103 (2008); http://dx.doi.org/10.1063/1.3001938 (3 pages) | Cited 5 times

Online Publication Date: 20 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report a formation method and an electrical characterization of aligned arrays of Au nanoparticles ( ∼ 20–40 nm). We synthesized the structure by immersing a substrate vertically into a solvent with nanoparticle and letting the solvent evaporate. The periodicity of the arrays has been controlled in 10–40 μm range by tuning the evaporation rate of solvent. The resistivity shows a drastic decrease ( ∼ 10−4) when annealed at ∼ 170 °C. While it is considerably due to a breakdown of ligands surrounding the Au particles, the large change in conductivity should be used for sensors to examine the interface molecules between Au nanoparticles.
Show PACS
81.07.Bc Nanocrystalline materials
73.25.+i Surface conductivity and carrier phenomena
61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)

Self-organized metal nanowire arrays with tunable optical anisotropy

A. Toma, D. Chiappe, D. Massabò, C. Boragno, and F. Buatier de Mongeot

Appl. Phys. Lett. 93, 163104 (2008); http://dx.doi.org/10.1063/1.3002319 (3 pages) | Cited 18 times

Online Publication Date: 20 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Here we report on the development of an unconventional approach for the physical synthesis of laterally ordered self-organized arrays of metallic nanowires supported on nanostructured dielectric templates. The method, based on a combination of nanoscale patterning of the glass substrate by ion beam sputtering with shadow deposition of the metal nanoparticles, provides a viable alternative to time consuming serial nanopatterning approaches. Far-field optical characterization demonstrates that the nanowire arrays exhibit tunable anisotropic properties in the visible range due to the excitation of localized plasmon resonances.
Show PACS
78.67.-n Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
73.22.Lp Collective excitations
81.15.Cd Deposition by sputtering
81.16.Rf Micro- and nanoscale pattern formation
81.16.Dn Self-assembly
61.46.Km Structure of nanowires and nanorods (long, free or loosely attached, quantum wires and quantum rods, but not gate-isolated embedded quantum wires)

Resonances of individual lithographic gold nanowires in the infrared

F. Neubrech, D. Weber, R. Lovrincic, A. Pucci, M. Lopes, T. Toury, and M. Lamy de La Chapelle

Appl. Phys. Lett. 93, 163105 (2008); http://dx.doi.org/10.1063/1.3003870 (3 pages) | Cited 9 times

Online Publication Date: 20 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
With infrared spectroscopic microscopy using synchrotron radiation, we systematically studied resonant light scattering from electron-beam lithographically produced gold nanowires (nanostripes) with diameters in the 100 nm range and with various lengths below 1 to about 2.5 μm. Similar to electrochemically grown cylindrical wires of high crystalline quality, clear antennalike plasmon resonances were observed for these stripelike and less-perfect wires. The resonance wavelength shifts with length as theoretically predicted for cylindrical gold antennas in the optical range. Surprisingly, also the extinction cross section of the nanostripes is equal to that measured for highly crystalline cylinders.
Show PACS
78.67.Lt Quantum wires
78.30.Er Solid metals and alloys

Immobilization of DNA-Au nanoparticles on aminosilane-functionalized aluminum nitride epitaxial films for surface acoustic wave sensing

Chi-Shun Chiu, Hong-Mao Lee, Cheng-Tai Kuo, and Shangjr Gwo

Appl. Phys. Lett. 93, 163106 (2008); http://dx.doi.org/10.1063/1.3003875 (3 pages) | Cited 5 times

Online Publication Date: 20 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A generic method for immobilization of gold nanoparticle bioconjugates onto aluminum nitride (AlN) surfaces using aminosilane molecules as cross-linkers is demonstrated for surface acoustic wave (SAW) sensor applications. Electrostatic interaction between positively charged surface amine groups and negatively charged DNA-Au nanoparticle conjugates allows the self-assembly of a probe nanoparticle monolayer onto functionalized AlN surfaces under physiological conditions. Both 10 and 20 nm Au nanoparticles bound with thiolated oligonucleotides were employed in the detection scheme. We show that Au nanoparticles can play multiple roles in SAW sensing for probe immobilization, signal amplification, and labeling.
Show PACS
43.60.Vx Acoustic sensing and acquisition
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
82.45.Yz Nanostructured materials in electrochemistry
87.14.gk DNA

High efficiency photodetectors fabricated by electrostatic layer-by-layer self-assembly of CdTe quantum dots

Chang-Ching Tu and Lih Y. Lin

Appl. Phys. Lett. 93, 163107 (2008); http://dx.doi.org/10.1063/1.3003883 (3 pages) | Cited 9 times

Online Publication Date: 20 October 2008

Full Text: Read Online (HTML) | Download PDF


See Also: Erratum

Show Abstract
We demonstrate high-performance photodetectors from multilayers of CdTe quantum dots (QDs). The QDs are synthesized and dispersed in aqueous solution with either 2-mercaptoethylamine (positively charged) or thioglycolic acid (negatively charged) as capping stabilizers. By electrostatic attraction, the charged QDs are self-assembled layer by layer on an indium tin oxide substrate modified with (3-aminopropyl)triethoxysilane. This process allows control of active layer thickness by self-assembly, and can in principle be applied to a wide range of substrates. The photodetector exhibits high responsivity (0.18 A/W) under 0.1 V bias due to extremely short capping ligands of QDs, which have high internal quantum efficiency, and the densely packed multilayer structure.
Show PACS
85.60.Gz Photodetectors (including infrared and CCD detectors)
81.07.Ta Quantum dots
81.16.Dn Self-assembly

High efficiency domain wall gate in ferromagnetic nanowires

Dorothée Petit, Ana-Vanessa Jausovec, Huang T. Zeng, Emma Lewis, Liam O’Brien, Dan Read, and Russell P. Cowburn

Appl. Phys. Lett. 93, 163108 (2008); http://dx.doi.org/10.1063/1.3005586 (3 pages) | Cited 6 times

Online Publication Date: 20 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A transverse domain wall (DW) switchable gate with a very high efficiency is experimentally demonstrated in Permalloy nanowires using a transverse T-shaped structure. DWs are found to either travel undisturbed through the open gate or to be strongly trapped in front of the closed gate only able to travel backwards. The opening and closing of the gate depends on the magnetic configuration of the gate and is controlled using externally applied magnetic fields. Micromagnetic simulations confirm the experimental results.
Show PACS
75.60.Ch Domain walls and domain structure
75.50.Bb Fe and its alloys
61.46.Km Structure of nanowires and nanorods (long, free or loosely attached, quantum wires and quantum rods, but not gate-isolated embedded quantum wires)

Reflectivity of disordered silicon nanowires

R. A. Street, P. Qi, R. Lujan, and W. S. Wong

Appl. Phys. Lett. 93, 163109 (2008); http://dx.doi.org/10.1063/1.3005585 (3 pages) | Cited 19 times

Online Publication Date: 21 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Disordered silicon nanowire mats have high diffuse optical reflectivity, in striking contrast to the low reflectivity of orientationally ordered nanowires. The reflectivity decreases with increasing photon energy across the visible and near infrared spectrum due to absorption in the nanowires. A simple model is used to estimate that the incident photon interacts with up to 20 nanowires before being reflected. A thin coating of hydrogenated amorphous silicon enhances the nanowire absorption.
Show PACS
78.67.Lt Quantum wires
78.40.Fy Semiconductors
78.30.Am Elemental semiconductors and insulators
78.35.+c Brillouin and Rayleigh scattering; other light scattering

Unidirectional formation of tetrahedral voids in irradiated silicon carbide

S. Kondo, Y. Katoh, and L. L. Snead

Appl. Phys. Lett. 93, 163110 (2008); http://dx.doi.org/10.1063/1.3005650 (3 pages) | Cited 5 times

Online Publication Date: 21 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The {111} tetrahedral voids induced by neutron irradiation in 3C-SiC were found to be spatially oriented in only one of two possible directions. The tetrahedral shape was unexpected as the surface-to-volume ratio is larger than the alternative {111} octahedral void common in both metals and ceramics. From a geometric viewpoint, all faces of the observed voids are either Si- or C-terminated surfaces. By comparing the surface area with the octahedral void (composed of the both Si- and C-surfaces) of the same volume, the considerable difference in surface energy between the Si(111) and C(mathmathmath) was implicated.
Show PACS
61.72.Qq Microscopic defects (voids, inclusions, etc.)
65.40.gp Surface energy
68.35.Md Surface thermodynamics, surface energies
61.80.Hg Neutron radiation effects

Growth and characterization of high-density mats of single-walled carbon nanotubes for interconnects

J. Robertson, G. Zhong, H. Telg, C. Thomsen, J. H. Warner, G. A. D. Briggs, U. Dettlaff-Weglikowska, and S. Roth

Appl. Phys. Lett. 93, 163111 (2008); http://dx.doi.org/10.1063/1.3000061 (3 pages) | Cited 26 times

Online Publication Date: 22 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We grow high-density, aligned single wall carbon nanotube mats for use as interconnects in integrated circuits by remote plasma chemical vapor deposition from a Fe–Al2O3 thin film catalyst. We carry out extensive Raman characterization of the resulting mats, and find that this catalyst system gives rise to a broad range of nanotube diameters, with no preferential selectivity of semiconducting tubes, but with at least 1/3 of metallic tubes.
Show PACS
61.46.Fg Nanotubes
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)
82.33.Xj Plasma reactions (including flowing afterglow and electric discharges)

Edge chirality determination of graphene by Raman spectroscopy

YuMeng You, ZhenHua Ni, Ting Yu, and ZeXiang Shen

Appl. Phys. Lett. 93, 163112 (2008); http://dx.doi.org/10.1063/1.3005599 (3 pages) | Cited 57 times

Online Publication Date: 22 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Raman imaging of single layer micromechanical cleavage graphene was carried out. The intensity of disorder-induced Raman feature (D band at ∼ 1350 cm−1) was found to be correlated to the edge chirality: it is stronger at the armchair edge and weaker at the zigzag edge. This shows that Raman spectroscopy is a reliable and practical method to identify the chirality of graphene edge and hence the crystal orientation. The determination of graphene chirality is critically important for fundamental study of graphene as well as applications of graphene-based devices.
Show PACS
61.46.-w Structure of nanoscale materials
78.30.Hv Other nonmetallic inorganics
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
78.67.-n Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures

Fabrication of triangular nanochannels using the collapse of hydrogen silsesquioxane resists

Sookyung Choi, Minjun Yan, and Ilesanmi Adesida

Appl. Phys. Lett. 93, 163113 (2008); http://dx.doi.org/10.1063/1.3006322 (3 pages) | Cited 7 times

Online Publication Date: 22 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report a simple method to fabricate nanometer-scale channels using hydrogen silsesquioxane (HSQ) resists. The collapse of high-aspect-ratio structures during the rinse and drying steps results in self-formed enclosed triangular-shaped channels. Using electron-beam lithography, dense arrays of HSQ triangular nanochannels were fabricated with high precision. This approach provides significant flexibility in design and simplicity in processing. We also show that the properties of HSQ resists are well suited for the fabrication of buried nanochannel structures.
Show PACS
81.16.Nd Micro- and nanolithography

Hydrogenation of Mg film and Mg nanoblade array on Ti coated Si substrates

Yuping He, Yiping Zhao, Liwei Huang, Howard Wang, and Russell J. Composto

Appl. Phys. Lett. 93, 163114 (2008); http://dx.doi.org/10.1063/1.3003880 (3 pages) | Cited 9 times

Online Publication Date: 23 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The hydrogenation of Mg film and Mg nanoblade array fabricated on Ti coated Si substrates has been studied and compared. The nanoblades start to absorb hydrogen at a temperature between 250 and 300 °C, which is much lower than 350 °C for Mg film. However, the saturated total hydrogen uptake in nanoblades is less than half of that in the film, resulting from MgO formation by air exposure. The nanoblade morphology with large surface area and small hydrogen diffusion length, and the catalytic effect of Ti layer, are two main reasons for the nanoblade hydrogenation behavior.
Show PACS
81.65.-b Surface treatments
84.60.-h Direct energy conversion and storage
62.23.-c Structural classes of nanoscale systems
66.30.Pa Diffusion in nanoscale solids

Fabrication of 0.5 nm electrode gaps using self-breaking technique

Makusu Tsutsui, Masateru Taniguchi, and Tomoji Kawai

Appl. Phys. Lett. 93, 163115 (2008); http://dx.doi.org/10.1063/1.3006063 (3 pages) | Cited 7 times

Online Publication Date: 23 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Control of electrode gap size formed by a self-breaking method is explored by statistically investigating electric field dependence of the gap distance using nanofabricated mechanically controllable break junctions. We obtained narrow distributions of the electrode gap size around 0.5 nm at biases below a threshold field. The self-breaking technique has thus been demonstrated to be a reliable tool for fabricating electrodes with subnanometer size gaps.
Show PACS
82.45.Fk Electrodes
73.63.Rt Nanoscale contacts

Electric energy generation in single track-etched nanopores

Yanbo Xie, Xinwei Wang, Jianming Xue, Ke Jin, Long Chen, and Yugang Wang

Appl. Phys. Lett. 93, 163116 (2008); http://dx.doi.org/10.1063/1.3001590 (3 pages) | Cited 26 times

Online Publication Date: 24 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We investigated the efficiency of electrical power generation in single track-etched nanopores by measuring the streaming currents and conductance. Experimental results indicate that both the efficiency and output power depend on the electrolyte concentration and the dimension of the pore. The highest efficiency of 5% was obtained in nanopores with small radii of 31 nm. The surface property of the track-etched nanopores was found very important to the kinetic-electric behaviors in the pores, especially when the electrolyte concentration was low.
Show PACS
84.60.Rb Thermoelectric, electrogasdynamic and other direct energy conversion
81.65.Cf Surface cleaning, etching, patterning
82.45.Gj Electrolytes

ZnO nanocoral structures for photoelectrochemical cells

Kwang-Soon Ahn, Yanfa Yan, Sudhakar Shet, Kim Jones, Todd Deutsch, John Turner, and Mowafak Al-Jassim

Appl. Phys. Lett. 93, 163117 (2008); http://dx.doi.org/10.1063/1.3002282 (3 pages) | Cited 18 times

Online Publication Date: 24 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report on synthesis of a uniform and large area of a new form of ZnO nanocorals. These nanostructures can provide suitable electrical pathways for efficient carrier collection as well as large surface areas for the photoelectrochemical (PEC) cells. PEC devices made from these ZnO nanocoral structures demonstrate significantly enhanced photoresponse as compared to ZnO compact and nanorod films. Our results suggest that the nanocoral structures could be an excellent choice for nanomaterial-based applications such as dye-sensitized solar cells, electrochromic windows, and batteries.
Show PACS
82.47.Jk Photoelectrochemical cells, photoelectrochromic and other hybrid electrochemical energy storage devices
82.45.Yz Nanostructured materials in electrochemistry

Highly luminescent surface-passivated ZnS:Mn nanoparticles by a simple one-step synthesis

Dae-Ryong Jung, Dongyeon Son, Jongmin Kim, Chunjoong Kim, and Byungwoo Park

Appl. Phys. Lett. 93, 163118 (2008); http://dx.doi.org/10.1063/1.3007980 (3 pages) | Cited 20 times

Online Publication Date: 24 October 2008

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Highly luminescent surface-passivated ZnS:Mn nanoparticles were synthesized straightforwardly by a simple liquid-solid-solution method. Compared to the pristine Mn-doped zinc sulfide nanocrystals (quantum efficiency: ∼ 19%), the Li-added ZnS:Mn exhibited significantly enhanced luminescence properties (quantum efficiency: ∼ 43%). The surface passivation was investigated by x-ray photoelectron spectroscopy, transmission electron microscopy, and by the change in the radiative/nonradiative recombination rates. The photoluminescence enhancement is due to the formation of an effective passivation layer induced by lithium, and consequent suppression of the nonradiative recombination transitions.
Show PACS
81.07.Bc Nanocrystalline materials
78.55.Et II-VI semiconductors
79.60.Jv Interfaces; heterostructures; nanostructures
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close