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

7 Feb 2011

Volume 98, Issue 6, Articles (06xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 98, 063101 (2011); http://dx.doi.org/10.1063/1.3551574 (3 pages)

Y. Z. He, H. Li, P. C. Si, Y. F. Li, H. Q. Yu, X. Q. Zhang, F. Ding, K. M. Liew, and X. F. Liu
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Dynamic ripples in single layer graphene

Y. Z. He, H. Li, P. C. Si, Y. F. Li, H. Q. Yu, X. Q. Zhang, F. Ding, K. M. Liew, and X. F. Liu

Appl. Phys. Lett. 98, 063101 (2011); http://dx.doi.org/10.1063/1.3551574 (3 pages) | Cited 4 times

Online Publication Date: 7 February 2011

Full Text: Read Online (HTML) | Download PDF

multimedia

Show Abstract
Similar to the water wave on a pond caused by dropping a pebble, the formation of ripples is shown in a single layer graphene (SLG) when it is stroked by a C60 molecule, no matter whether the graphene is plane or corrugated. The controllable ripple in SLG is investigated by molecular dynamics simulations. Noticeable diffraction and interference of the ripples are observed. This study indicates that the ripple propagation in graphene can be used to detect defects.
Show PACS
61.20.Ja Computer simulation of liquid structure
47.35.Lf Wave-structure interactions
61.48.Gh Structure of graphene

Raman study of interfacial load transfer in graphene nanocomposites

Iti Srivastava, Rutvik J. Mehta, Zhong-Zhen Yu, Linda Schadler, and Nikhil Koratkar

Appl. Phys. Lett. 98, 063102 (2011); http://dx.doi.org/10.1063/1.3552685 (3 pages) | Cited 11 times

Online Publication Date: 7 February 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We tracked the strain-sensitive characteristic Raman G-band shift of graphene platelets in polydimethyl-siloxane (PDMS) nanocomposites revealing the filler-to-matrix interactions. We obtained large debonding strains of ∼ 7% for graphene in PDMS, with the peak shift rate with strain being ∼ 2.4 cm−1/composite strain % in comparison to single-walled carbon nanotube composites, where a relatively low rate of ∼ 0.1 cm−1/composite strain % was obtained, suggesting enhanced load-transfer effectiveness for graphene. A surprising observation was that for large strains (>1.5%) the graphene fillers went into compression under uniaxial tensile deformation and vice versa. We propose that this effect is related to the high mobility of the PDMS chains at room temperature.
Show PACS
78.67.Sc Nanoaggregates; nanocomposites
81.05.uj Diamond/nanocarbon composites
81.40.Lm Deformation, plasticity, and creep
62.20.F- Deformation and plasticity
78.30.-j Infrared and Raman spectra

All-printed infrared sensor based on multiwalled carbon nanotubes

A. Gohier, A. Dhar, L. Gorintin, P. Bondavalli, Y. Bonnassieux, and C. S. Cojocaru

Appl. Phys. Lett. 98, 063103 (2011); http://dx.doi.org/10.1063/1.3552686 (3 pages) | Cited 6 times

Online Publication Date: 7 February 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
This contribution deals with all-printed infrared sensors fabricated using multiwalled carbon nanotubes deposited on a flexible polyimide substrate. A high responsivity of up to 1.2 kV/W is achieved at room temperature in ambient air. We evidence a strong dependence of the device transduction mechanism on the surrounding atmosphere, which can be attributed to bolometric effect interference with water molecule desorption upon irradiation.
Show PACS
85.60.Gz Photodetectors (including infrared and CCD detectors)
85.35.Kt Nanotube devices
07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors
81.07.De Nanotubes

Direct current dielectric barrier discharges under voltages below the ionization potential of neutrals in electrode systems with one-dimensional nanostructures

Zhongyu Hou, Weimin Zhou, Yanyan Wang, and Bingchu Cai

Appl. Phys. Lett. 98, 063104 (2011); http://dx.doi.org/10.1063/1.3552709 (3 pages) | Cited 3 times

Online Publication Date: 7 February 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We experimentally investigate the characteristics of dielectric barrier discharges in an electrode system with one-dimensional nanostructures of gap size at micrometer scale. Evidence of quasistationary direct current discharges in air has been observed under the applied voltage several times lower than the first ionization potential of O2. The results qualitatively agree with the hypothesis on the ionization mechanism of stepwise inelastic collisions within a metastable pool, which is populated through field excitation and inelastic impact between the neutrals and the nanostructures.
Show PACS
52.80.-s Electric discharges
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions
52.25.Fi Transport properties
52.25.Jm Ionization of plasmas

Amplified spontaneous emission from core and shell transitions in CdSe/CdS nanorods fabricated by seeded growth

Roman Krahne, Margherita Zavelani-Rossi, Maria Grazia Lupo, Liberato Manna, and Guglielmo Lanzani

Appl. Phys. Lett. 98, 063105 (2011); http://dx.doi.org/10.1063/1.3549298 (3 pages) | Cited 3 times

Online Publication Date: 8 February 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We studied the optical properties of core-shell CdSe/CdS nanorods with various lengths and core diameters that were fabricated by wet chemical synthesis using the seeded growth method. We investigated the optical emission from thin films consisting of dense nanorod arrays, where we observed amplified spontaneous emission from states related either to the CdSe core or to the CdS shell depending on the nanorod’s length. The optical gain of the nanorods was studied by transient absorption experiments and we found optical gain for the core and shell states of short rods, whereas for long rods, the optical gain of the core was quenched by defect states and we observed optical gain solely from the states of the shell material.
Show PACS
81.07.Bc Nanocrystalline materials
68.55.ag Semiconductors
78.66.Hf II-VI semiconductors
81.05.Dz II-VI semiconductors
78.55.Et II-VI semiconductors

π junction transition in InAs self-assembled quantum dot coupled with SQUID

S. Kim, R. Ishiguro, M. Kamio, Y. Doda, E. Watanabe, D. Tsuya, K. Shibata, K. Hirakawa, and H. Takayanagi

Appl. Phys. Lett. 98, 063106 (2011); http://dx.doi.org/10.1063/1.3552715 (3 pages) | Cited 2 times

Online Publication Date: 8 February 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report the transport measurements on the InAs self-assembled quantum dots (SAQDs) which have a unique structural zero-dimensionality, coupled to a superconducting quantum interference device (SQUID). Owing to the SQUID geometry, we directly observe a π phase shift in the current phase relation and the negative supercurrent indicating π junction behavior by not only tuning the energy level of SAQD by back-gate but also controlling the coupling between SAQD and electrodes by side-gate. Our results inspire the future quantum information devices which can link optical, spin, and superconducting state.
Show PACS
73.40.Kp III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
85.25.Dq Superconducting quantum interference devices (SQUIDs)
81.05.Ea III-V semiconductors
73.63.Kv Quantum dots
81.16.Dn Self-assembly

Influence of gas rarefaction on the lateral resolution achievable by thermocapillary patterning

Nan Liu and Sandra M. Troian

Appl. Phys. Lett. 98, 063107 (2011); http://dx.doi.org/10.1063/1.3551535 (3 pages)

Online Publication Date: 8 February 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Molten polymer nanofilms subject to a large transverse thermal gradient can undergo a thermocapillary instability leading to the growth of nanopillar arrays on the cooler side. The array pitch can be estimated from the fastest growing wavelength from linear stability analysis. Here we quantify the influence of gas rarefaction on thermal conduction for cases in which the gas layer thickness above the film approaches dimensions of the molecular mean free path. For experimentally relevant parameters, rarefaction increases the pitch by as much as 65%, an important consideration for noncontact three-dimensional structure formation by thermocapillary lithography.
Show PACS
47.85.md Polymer processing flows
47.57.Ng Polymers and polymer solutions
47.55.nb Capillary and thermocapillary flows
47.50.Gj Instabilities
47.45.Dt Free molecular flows
81.16.Rf Micro- and nanoscale pattern formation

Stability and electronic structure of bilayer graphone

J. Zhou, Q. Wang, Q. Sun, and P. Jena

Appl. Phys. Lett. 98, 063108 (2011); http://dx.doi.org/10.1063/1.3555431 (3 pages) | Cited 2 times

Online Publication Date: 9 February 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Stability, reconstruction, and electronic structure of a bilayer graphone have been studied, where the most stable configuration undergoes a (1×2) surface reconstruction. An energy barrier of 1.83 eV separates this structure from the nonbonded state. The stability of the reconstructed bilayer at room temperature is confirmed by both frequency calculation and molecular dynamics simulation. Unlike the graphone sheet, the bilayer graphone is nonmagnetic but remains metallic due to the existence of delocalized π orbital on the zigzag sp2 carbon chains, which are stable against Peierls instability. The metallicity is also stable under gate external electric field.
Show PACS
71.20.Tx Fullerenes and related materials; intercalation compounds
71.15.Pd Molecular dynamics calculations (Car-Parrinello) and other numerical simulations
68.35.bp Fullerenes
71.30.+h Metal-insulator transitions and other electronic transitions

Motional modes in bulk powder and few-molecule clusters of tris(8-hydroxyquinoline aluminum) and their relation to spin dephasing

Lopamudra Das, Jennette Mateo, Saumil Bandyopadhyay, Supriyo Bandyopadhyay, Jarrod D. Edwards, and John Anderson

Appl. Phys. Lett. 98, 063109 (2011); http://dx.doi.org/10.1063/1.3554753 (3 pages) | Cited 1 time

Online Publication Date: 10 February 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The ensemble averaged spin dephasing rate of localized electrons in the organic molecule tris(8-hydroxyquinoline aluminum) or Alq3 has been found to be significantly larger in bulk powder than in single- or few-molecule clusters confined within 1–2 nm sized nanocavities [ B. Kanchibotla et al., Phys. Rev. B 78, 193306 (2008)] . To understand this observation, we have compared the midinfrared absorption spectra of bulk powder and single- or few-molecule clusters. It appears that molecules have additional vibrational modes in bulk powder possibly due to multimerization. Their coupling with spin may be responsible for the increased spin dephasing rate in bulk powder.
Show PACS
78.30.Jw Organic compounds, polymers
36.40.-c Atomic and molecular clusters
33.15.Mt Rotation, vibration, and vibration-rotation constants
33.20.Ea Infrared spectra

The mechanical resonances of electrostatically coupled nanocantilevers

S. Perisanu, T. Barois, P. Poncharal, T. Gaillard, A. Ayari, S. T. Purcell, and P. Vincent

Appl. Phys. Lett. 98, 063110 (2011); http://dx.doi.org/10.1063/1.3553779 (3 pages) | Cited 1 time

Online Publication Date: 10 February 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We present here an experimental study of the electrostatic coupling between the mechanical resonances of two nanowires or two nanotubes. This coupling occurs when the eigenfrequencies of the two resonators are matched by electrostatic tuning and it changes from a weak coupling to a strong coupling regime as the distance between the cantilevers is decreased. Linear coupling theory is shown to be in excellent agreement with the experimental data.
Show PACS
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
81.07.Oj Nanoelectromechanical systems (NEMS)
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close