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13 Oct 2008

Volume 93, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 93, 151101 (2008); http://dx.doi.org/10.1063/1.2996271 (3 pages)

Xuefeng Zeng and Hongrui Jiang
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Characterization of Pt/multiferroic BiFeO3/(Ba,Sr)TiO3/Si stacks for nonvolatile memory applications

Chia-Shiu Yeh and Jenn-Ming Wu

Appl. Phys. Lett. 93, 154101 (2008); http://dx.doi.org/10.1063/1.3001800 (3 pages) | Cited 8 times

Online Publication Date: 15 October 2008

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The Pt/BiFeO3(BFO)/(Ba,Sr)TiO3(BST)/Si metal-ferroelectric-insulator/Si (MFIS) structures were fabricated by rf-magnetron sputtering. The electric properties of the BFO ferroelectric film with BST insulating buffer on Si substrates were investigated. BST demonstrates excellent insulating properties on Si substrates. The MFIS structure exhibits clockwise capacitance-voltage hysteresis loops due to the ferroelectric polarization of BFO. The maximum memory window of the MFIS is 3.86 V, which is a remarkable improvement in comparison with previously reported 0.8 V. Trapped charge and charge injection are found to initiate when the sweeping voltage is higher than 8 and 9 V, respectively.
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73.40.Qv Metal-insulator-semiconductor structures (including semiconductor-to-insulator)
85.50.Gk Non-volatile ferroelectric memories
77.80.Dj Domain structure; hysteresis
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping

Detection of adsorbed explosive molecules using thermal response of suspended microfabricated bridges

Dechang Yi, Anders Greve, Jan H. Hales, Larry R. Senesac, Zachary J. Davis, Don M. Nicholson, Anja Boisen, and Thomas Thundat

Appl. Phys. Lett. 93, 154102 (2008); http://dx.doi.org/10.1063/1.3002285 (3 pages) | Cited 9 times

Online Publication Date: 16 October 2008

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Here we present a thermophysical technique that is capable of differentiating vapor phase adsorbed explosives from nonexplosives and is additionally capable of differentiating individual species of common explosive vapors. This technique utilizes pairs of suspended microfabricated silicon bridges that can be heated in a controlled fashion. The differential thermal response of the bridges with and without adsorbed explosive vapor shows unique and reproducible characteristics depending on the nature of the adsorbed explosives. The tunable heating rate method described here is capable of providing unique signals for subnanogram quantities of adsorbed explosives within 50 ms.
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85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
82.80.-d Chemical analysis and related physical methods of analysis
82.33.Vx Reactions in flames, combustion, and explosions
68.43.-h Chemisorption/physisorption: adsorbates on surfaces
07.10.Cm Micromechanical devices and systems

Effect of free electrons on nanoparticle charging in a negative direct current corona charger

A. Aliat, C.-J. Tsai, C.-T. Hung, and J.-S. Wu

Appl. Phys. Lett. 93, 154103 (2008); http://dx.doi.org/10.1063/1.2967470 (3 pages) | Cited 6 times

Online Publication Date: 16 October 2008

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A two-dimensional numerical model is proposed in this letter to take into account the effects of free electrons on nanoparticle charging in a negative direct current wire-tube corona charger. Numerical results are in excellent agreement with the experimental data by using a capturing probability of electrons onto nanoparticles with a value of 0.013. These free electrons contribute greatly to the charging efficiency at high products of mean ion concentration and mean residence time, which explains very well the large discrepancy found in earlier models that considered only negative ions.
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52.80.Hc Glow; corona
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