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18 Feb 2008

Volume 92, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 92, 073101 (2008); http://dx.doi.org/10.1063/1.2840574 (3 pages)

N. W. Gong, M. Y. Lu, C. Y. Wang, Y. Chen, and L. J. Chen
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Au(Si)-filled β-Ga2O3 nanotubes as wide range high temperature nanothermometers

N. W. Gong, M. Y. Lu, C. Y. Wang, Y. Chen, and L. J. Chen

Appl. Phys. Lett. 92, 073101 (2008); http://dx.doi.org/10.1063/1.2840574 (3 pages) | Cited 9 times

Online Publication Date: 19 February 2008

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Au(Si)-filled β-Ga2O3 nanotubes were fabricated by an effective one-step chemical vapor deposition method. The Au(Si) interior was introduced by capillarity. Linear thermal expansion of Au(Si) with a coefficient of thermal expansion (CTE) as high as 1.5×10−4(1/K) within single crystal Ga2O3 shell up to 800° C was observed by in situ transmission electron microscopy. The high CTE is correlated to partial melting of Au(Si). As Ga2O3 possesses excellent thermal and chemical stability, the structure can be used as a wide range high-temperature nanothermometer within localized regions of nanosystems.
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61.46.Fg Nanotubes
65.40.De Thermal expansion; thermomechanical effects
81.16.-c Methods of micro- and nanofabrication and processing

High density platinum nanocrystals for non-volatile memory applications

J. Dufourcq, S. Bodnar, G. Gay, D. Lafond, P. Mur, G. Molas, J. P. Nieto, L. Vandroux, L. Jodin, F. Gustavo, and Th. Baron

Appl. Phys. Lett. 92, 073102 (2008); http://dx.doi.org/10.1063/1.2840188 (3 pages) | Cited 22 times

Online Publication Date: 19 February 2008

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High density self-assembled platinum nanodots are elaborated using a radio frequence sputtering technique and embedded in memory structures. Electronic microscopy methods are used to characterize the morphology. Scanning electron microscopy and scanning transmission electron microscopy observations allow quantification of the density (>3×1012 cm−2) and size (2–3 nm) of the nanocrystals, whereas their crystallinity is investigated using high-resolution transmission electron microscopy. Then, capacitance-voltage sweep measurements give excellent memory characteristics with a 7.1 V maximal memory window. Promising retention performances and an estimation of the number of electrons stored in the metallic nanodots are also given in this paper.
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81.16.Dn Self-assembly
61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)

Temperature dependent photoluminescence study on phosphorus doped ZnO nanowires

C. X. Shan, Z. Liu, and S. K. Hark

Appl. Phys. Lett. 92, 073103 (2008); http://dx.doi.org/10.1063/1.2884312 (3 pages) | Cited 30 times

Online Publication Date: 21 February 2008

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We report temperature dependent photoluminescence studies on phosphorus doped ZnO nanowires. The shape of the spectra is very similar to those of phosphorus doped ZnO films. The photoluminescence spectrum at 10 K is dominated by neutral acceptor bound exciton (A 0X) emissions. The acceptor binding energy determined also agrees with the corresponding value in phosphorus doped films. Studies on the A 0X intensity show two quenching channels, associated with the thermal dissociations of A 0X to a free exciton and of shallow residual donors. The residual donors revealed provide a clue for the difficulty in p doping of ZnO.
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78.67.-n Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
78.55.Et II-VI semiconductors
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)
73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
71.35.-y Excitons and related phenomena

Maskless electrodeposited contact for conducting polymer nanowires

Carlos M. Hangarter, Mangesh Bangar, Sandra C. Hernandez, Wilfred Chen, Marc A. Deshusses, Ashok Mulchandani, and Nosang V. Myung

Appl. Phys. Lett. 92, 073104 (2008); http://dx.doi.org/10.1063/1.2883923 (3 pages) | Cited 8 times

Online Publication Date: 25 February 2008

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This letter reports a simple and scalable method to create mechanical joints and electrical contacts of conducting polymer nanowires to electrodes by selective maskless metal electrodeposition on electrodes. This is an attractive route for contacting nanowires as it bypasses harsh processing conditions of conventional methods. The electrodeposition conditions and initial resistance of the nanowires were found to have a significant impact on the selective maskless deposition. Different dopants were also investigated to understand the polymer reduction during cathodic deposition of metal. A single dodecyl sulfate doped polypyrrole nanowire with maskless electrodeposited nickel contacts was shown to have improved sensitivity toward ammonia gas.
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73.40.Ns Metal-nonmetal contacts
73.63.Nm Quantum wires
81.15.Pq Electrodeposition, electroplating
82.45.Qr Electrodeposition and electrodissolution
82.45.Fk Electrodes
82.30.-b Specific chemical reactions; reaction mechanisms
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