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Effect of γ-irradiation on the sheet resistance of two-dimensional island platinum films

机译：γ辐照对二维岛状铂膜薄膜电阻的影响

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摘要

Four sets (A, B, C, and D) of two-dimensional island platinum films were prepared via the thermal evaporation technique. The mass thicknesses of the films of the different sets are 1, 5, 10, and 20 A, respectively. The sheet resistance of these films was found experimentally from knowing the d.c. resistance of the films. Before exposing the films to γ-rays, we monitored the increase in the sheet resistance in air with time (aging) till short-term stability for the films was achieved. The stabilized films were exposed to γ-rays such that the different doses are 100, 200, 300, 500, and 700 Gy using ~(137)Cs (0.662 MeV) radiation source with dose rate 0.5 Gy/min. It was found that; (i) the sheet resistance of the investigated films decreases with the increase in the dose, (ii) for any particular mass thickness, the value of the fractional change in sheet resistance increases with the increase in dose, (iii) for any particular dose the increase in the fractional change in sheet resistance becomes more pronounced with the increase in mass thickness. Qualitative interpretation for our results was given on the ground that γ-rays changed the shape of islands from spherical to prolate.
机译：通过热蒸发技术制备了四组（A，B，C和D）二维岛状铂膜。不同组的膜的质量厚度分别为1、5、10和20A。这些膜的薄层电阻是从已知的直流电实验中找到的。薄膜的电阻。在将膜暴露于γ射线之前，我们监测了空气中薄层电阻随时间（老化）的增加，直至达到膜的短期稳定性。使用〜（137）Cs（0.662 MeV）辐射源，以0.5 Gy / min的剂量率，将稳定化的薄膜暴露于γ射线，以使不同的剂量分别为100、200、300、500和700 Gy。发现： （i）所研究薄膜的薄层电阻随剂量的增加而降低；（ii）对于任何特定的质量厚度，薄层电阻的分数变化值随剂量的增加而增加；（iii）对于任何特定剂量随着质量厚度的增加，薄层电阻的分数变化的增加变得更加明显。对我们的结果的定性解释是基于γ射线将岛的形状从球形变为扁长形。

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  • 来源
    《Journal of materials science》 |2009年第8期|713-717|共5页
  • 作者

    S. El-Gamal; A. G. Bishay; W. Fikry; S. M. Diab; S. Eid;

  • 作者单位

    Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt;

    Engineering Mathematics and Physics Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt;

    Engineering Mathematics and Physics Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt;

    Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt;

    Engineering Mathematics and Physics Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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