Misting-free diamond surface created by sheet electron beam irradiation
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Nobuhiro Iwataka Department of Materials Science, Tokai University, 1117, Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan
Akira Tonegawa Department of Physics, Tokai University, 1117, Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan
Yoichi Hirose Department of Electronics, Tokai University, 1117, Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan
Kazuo Takayama Honorary Professor of Tokai University, 1117, Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan
Yoshitake Nishi Department of Materials Science, Tokai University, 1117, Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan (Received 2 December 1999; accepted 9 November 2000)
We developed a diamond surface that does not mist near the room temperature under a saturated humidity atmosphere, by sheet electron beam irradiation (SEBI) treatment. SEBI treatment decreased the time to clear vision of the diamond surface. Following SEBI treatment for 1.91 s (⳱ 0.72 MGy) to a diamond surface, the time to clear vision was less than 2 s. The effective duration time was a few hours. Based on the results of the size distribution of the drops on the misting-free diamond surface following blowing for 3 s, we proposed an explanation for the short time to clear vision of the diamond surface treated by SEBI.
I. INTRODUCTION
A diamond coating enhances the resistance to scratch, and application of a diamond coating to the hard window of infrared sensors is beneficial. A serious problem with the infrared windows of sensors is misting of the diamond window. If the infrared ray is transmitted through the misted diamond window, accurate results can not be obtained. Misting-free windows would reduce the energy loss of analytical instruments such as Fourier transform infrared microscopes. We propose a countermeasure against misting of the diamond window of the infrared sensor. Human eyes give a hint. Since clear vision is achieved by tears on the eyes, we have tried to enhance the wettability of the diamond surface.1,2 This can be commercially achieved by safe and convenient irradiation. Since plasma irradiation generally results in the retention of residual impurities in samples, the effect may not be reproducible. On the other hand, sheet electron beam irradiation (SEBI) may induce clear vision without residual impurity atoms. The misting-free dentist mirror has been developed by SEBI treatment.3 However, clear vision has not been confirmed through a diamond winJ. Mater. Res., Vol. 16, No. 2, Feb 2001
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dow treated with SEBI. Therefore, we studied the effect of applying SEBI to a diamond surface on the time to clear vision of the misted diamond surface. II. EXPERIMENTAL PROCEDURE
Diamonds were produced by chemical vapor deposition (CVD) under atmospheric pressure, according to the procedure developed by Y. Hirose.4,5 The CVD conditions are summarized in Table I. SEBI was homogeneously applied with an electron curtain processor (Type: CBI175/15/180L, Energy Science Inc., Woburn, MA; Iwasaki Electric Group Company, Tokyo, Japan).5
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