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首页> 外文期刊>Applied Surface Science >High fluence deposition of polyethylene glycol films at 1064 nm by matrix assisted pulsed laser evaporation (MAPLE)
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High fluence deposition of polyethylene glycol films at 1064 nm by matrix assisted pulsed laser evaporation (MAPLE)

机译：通过基质辅助脉冲激光蒸发（MAPLE）在1064 nm处高通量沉积聚乙二醇薄膜

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摘要

Matrix assisted pulsed laser evaporation (MAPLE) has been applied for deposition of thin polyethylene glycol (PEG) films with infrared laser light at 1064 nm. We have irradiated frozen targets (of 1 wt.% PEG dissolved in water) and measured the deposition rate in situ with a quartz crystal microbalance. The laser fluence needed to produce PEG films turned out to be unexpectedly high with a threshold of 9 J/cm~2, and the deposition rate was much lower than that with laser light at 355 nm. Results from matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) analysis demonstrate that the chemistry, molecular weight and polydispersity of the PEG films were identical to the starting material. Studies of the film surface with scanning electron microscopy (SEM) indicate that the Si-substrate is covered by a relatively homogenous PEG film with few bare spots.
机译：基质辅助脉冲激光蒸发（MAPLE）已应用于1064 nm红外激光沉积聚乙二醇（PEG）薄膜。我们已经辐照了冷冻的目标（溶于水中的1 wt。％PEG），并用石英晶体微量天平原位测量了沉积速率。产生PEG膜所需的激光通量出乎意料地高，阈值为9 J / cm〜2，并且沉积速率远低于355 nm的激光。基质辅助激光解吸/电离飞行时间质谱（MALDI-TOF-MS）分析的结果表明，PEG膜的化学性质，分子量和多分散性与原料相同。用扫描电子显微镜（SEM）对膜表面的研究表明，硅基底被相对均匀的PEG膜覆盖，几乎没有裸点。

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