Yung‐Shao Lin

National Chiayi University

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Chang‐Feng Yu

National Chiayi University

Wenjia Xie

Sichuan University

Sy‐Hann Chen

National Chiayi University

Vladimir V. Tsukruk

Georgia Institute of Technology

Ting-Wei Hsu

National Synchrotron Radiation Research Center

Din Ping Tsai

City University of Hong Kong

Che‐Wei Sung

National Health Research Institutes

Chengyu Shen

National Chiayi University

Hennady P. Shulha

University of British Columbia

Chyung Ay

National Chiayi University

Cooperative Institutions

National Chiayi University

Iowa State University

National Tsing Hua University

Georgia Institute of Technology

National Yang Ming Chiao Tung University

Cornell University

Wright-Patterson Air Force Base

Korea Institute of Science and Technology

National Taiwan University

National Health Research Institutes

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Nanoscale surface electrical properties of zinc oxide films investigated by conducting atomic force microscopy

Microscopy Research and Technique (2007)

Chang‐Feng Yu Sy‐Hann Chen Wenjia Xie Yung‐Shao Lin Chengyu Shen

Abstract In this study, conducting atomic force microscopy was employed to investigate the nanoscale surface electrical properties of zinc oxide (ZnO) films prepared by pulsed laser deposition (PLD) at different substrate temperatures for use as anode materials in polymer light‐emitting diodes. The results show that the surface conductivity distribution of ZnO is related to its surface structure. At substrate temperatures of 150–200°C, the conducting regions may cover over 90% of the ZnO thin‐film surface, thus providing the best local conductivity. Moreover, heating at substrate temperatures of above 250°C can effectively make the conductivity on the ZnO surface uniform. In particular, at substrate temperatures of around 300°C, the conducting regions where currents are between 1 and 2 μA may cover as much as 83% of the surface, and furthermore, the transmission ratio in the visible range is higher than 80%. This is a rather ideal production temperature for the PLD for ZnO films. Microsc. Res. Tech., 2008. © 2007 Wiley‐Liss, Inc.

Pulsed Laser Deposition

Transparent conducting film

Surface conductivity

10.1002/jemt.20517

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Citations (17)

Erratum: “Nanoscale surface electrical properties of aluminum zinc oxide thin films investigated by scanning probe microscopy” [J. Appl. Phys. 104, 114314 (2008)]

Journal of Applied Physics (2009)

Sy‐Hann Chen Chang‐Feng Yu Yung‐Shao Lin Wenjia Xie Ting-Wei Hsu

First Page

Aluminum Oxide

Scanning Probe Microscopy

Zinc compounds

10.1063/1.3177343

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Nanoscale surface electrical properties of aluminum zinc oxide thin films investigated by scanning probe microscopy

Journal of Applied Physics (2008)

Sy‐Hann Chen Chang‐Feng Yu Yung‐Shao Lin Wenjia Xie Ting-Wei Hsu

Conducting atomic force microscopy and scanning surface potential microscopy were adopted to study the nanoscale surface electrical properties of aluminum zinc oxide (AZO) films that were prepared by pulsed laser deposition (PLD) at various substrate temperatures for use as anode materials in polymer light-emitting diodes (PLEDs). Experimental results indicate that when substrate temperatures exceed 100°C, the local conductivity and work function are positively correlated with the concentrations of Al dopant and O2− on AZO surface. When the substrate temperature is approximately 150°C, the percentage coverage of conducting regions of the AZO surface and the mean work function are 90.20% and 4.85eV, respectively. Additionally, both microcosmic uniformities meet the standard applied to PLEDs. This low-temperature condition for PLD significantly reduces the yield rate of impurities when AZO vacuum evaporation is performed on a plastic substrate, supporting various applications of AZO films.

Vacuum evaporation

10.1063/1.3042237

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Multilayered Nanoscale Systems and Atomic Force Microscopy Mechanical Measurements

ACS symposium series (2005)

Hennady P. Shulha Yung‐Shao Lin Vladimir V. Tsukruk

The atomic force microscopy approach developed for the microindentation of layered elastic solids was adapted to analyze nanoprobing of ultrathin (1-10 nm thick) polymer films on a solid substrate. This "graded" approach offered a transparent consideration of the gradient of the mechanical properties between layers with different elastic properties. Some examples of recent applications of this model to nanoscale polymer layers were presented. We considered polymer layers with elastic moduli ranging from 0.1 to 20 MPa in a solvated state. A complex shape of corresponding loading curves and elastic modulus depth profiles obtained from experimental data were fitted by the graded functions suggested.

Nanomechanics

Elasticity

10.1021/bk-2005-0897.ch010

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Microtribological and Nanomechanical Properties of Switchable Y-Shaped Amphiphilic Polymer Brushes

Advanced Functional Materials (2005)

Melburne C. LeMieux Yung‐Shao Lin Pham Duc Cuong Hyo-Sok Ahn Eugene R. Zubarev

We have characterized the morphology and nanomechanical properties of surface-grafted nanoscale layers consisting of Y-shaped binary molecules with one polystyrene (PS) arm and one poly(acrylic acid) (PAA) arm. We examined these amphiphilic brushes in fluids (in-situ visualization), and measured their microtribological characteristics as a function of chemical composition. Atomic force microscopy (AFM)-based nanomechanical testing has shown that nanoscale reorganization greatly influences the adhesion and elastic properties of the nanoscale brush layer. In water, a bimodal distribution of the elastic modulus, arising from the mixed chemical composition of the topmost layer, is observed. In contrast, the top layer is completely dominated by PS in toluene. As a result of this reorganization, the Y-shaped-brush layer exhibits a dramatic variation in the friction and wear properties after exposure to different solvents. Unexpectedly, the tribological properties are enhanced for the hydrophilic and polar, PAA-dominated, surface, which shows a lower friction coefficient and higher wear stability, despite higher adhesion and heterogeneous surface composition. We suggest that this unusual behavior is caused by the combination of the presence of a thicker water layer on the PAA-enriched surface that acts as a boundary lubricant and the glassy state of the PAA chains.

Polystyrene

10.1002/adfm.200500088

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Citations (63)