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A mechanism of surface hardness enhancement for H + irradiated polycarbonate.

Authors :: Yeo S
Cho WJ
Kim DS
Lee CY
Hwang YS
Suk JK
Kim C
Ha JM
Source :: RSC advances [RSC Adv] 2020 Aug 04; Vol. 10 (48), pp. 28603-28607. Date of Electronic Publication: 2020 Aug 04 (Print Publication: 2020).
Publication Year :: 2020
Abstract: H <superscript>+</superscript> irradiation increases the surface hardness of polycarbonate. Nano indentation measurement shows that the hardness increases up to 3.7 GPa at the dose of 5 × 10 <superscript>16</superscript> # cm <superscript>-2</superscript> and at the irradiation energy of 150 keV. In addition, the hardness increases with the dose and the energy of H <superscript>+</superscript> irradiation. In accordance with the nano indentation measurement, the Fourier-transform infrared spectroscopy (FTIR) depends on the dose and energy of H <superscript>+</superscript> irradiation. The peak at ∼1500 cm <superscript>-1</superscript> for the aromatic ring and the peak at ∼1770 cm <superscript>-1</superscript> for the C[double bond, length as m-dash]O stretch decrease with increasing dose and energy, while the increase of the dose and energy develops a new C[double bond, length as m-dash]O stretch vibration at ∼1700 cm <superscript>-1</superscript> and forms aromatic hydrocarbons at ∼1600 cm <superscript>-1</superscript> . X-ray diffraction experiments are also consistent with the nano indentation measurement and FTIR spectra. Based on the experiments, we discuss a possible mechanism of the surface hardness enhancements by ion beam irradiation.<br />Competing Interests: There are no conflicts to declare.<br /> (This journal is © The Royal Society of Chemistry.)