Photosensitivity enhancement at visible in Polyvinylpyrrolidone-based polymers doped with Fe and Cu ions

Pan, Mingming; Guo, Chengcheng; Ma, Zhuang; Chen, Liyun; Li, Qiang; Wu, Lijun

doi:10.1016/j.cplett.2020.137640

Cited by 4 publications

(6 citation statements)

References 27 publications

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“…Our previous paper has reported that the Fe-doped composite polymer film is amorphous after irradiated by a laser beam. [38] For obtaining LIPSS in amorphous polymers, the temperature should be higher than its glass transition temperature (Tg) to allow polymer chains to rearrange. [45] Figure 8 shows that when Fe ions are doped into the PVP polymer, Tg can be reduced from 202.25°C to 130.28°C, which can reduce the required energy for forming LIPSS.…”

Section: The Formation Mechanism Of the C-nanogratingsmentioning

confidence: 99%

“…Although the photonic band gap Eg of PVP is shrunk from 5.0 eV to 2.7 eV when Fe ions are introduced, [38] the Fe-doped composite film is initially transparent to the laser pulses and its conduction band is empty. However, if the intensity is sufficiently high, electrons in the valence band can be transferred into the conduction band via nonlinear ionization processes under fs laser irradiation.…”

Section: The Formation Mechanism Of the C-nanogratingsmentioning

confidence: 99%

“…On the other hand, as we have analyzed in our previous paper, Fe ions are inclined to be bound with the lone pair electrons on the oxygen atom of PVP. [38] This kind of coordination bonds can act as sacrificial bonds and provide a bridge between the ultrashort laser pulses and the composite for ultrafast subcycle energy transfer. [56] Consequently, the hot-electron transport and diffusion can be ignored, i.e.…”

Section: The Comprehensive Mechanism Of Forming the U-nanogratingsmentioning

confidence: 99%

“…[37] By introducing Fe or Cu ions within, its photosensitivity in the visible spectrum region can be enhanced. [38] In this paper, we investigate the interaction between the PVP-based composite film and fs pulsed lasers with two different repetition rates, in which different spatial profile of the focused Gaussian beam is provided to explore the mechanism behind the nanogratings. The addition of Fe ions into the PVP polymer not only increases its photosensitivity [38] but also lowers its glass transition temperature Tg, which reduces the bonding energy of the solidified PVP composite.…”

Section: Introductionmentioning

confidence: 99%

“…[38] In this paper, we investigate the interaction between the PVP-based composite film and fs pulsed lasers with two different repetition rates, in which different spatial profile of the focused Gaussian beam is provided to explore the mechanism behind the nanogratings. The addition of Fe ions into the PVP polymer not only increases its photosensitivity [38] but also lowers its glass transition temperature Tg, which reduces the bonding energy of the solidified PVP composite. Furthermore, the bonding mode of the coordination bond between Fe ions and PVP provides a bridge between the fs laser pulses and the composite for ultrafast subcycle energy transfer, which greatly reduces the thermal effect.…”

Section: Introductionmentioning

confidence: 99%

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Sub-40nm Nanogratings Self-Organized in PVP-based Polymer Composite Film by Photoexcitation and Two Sequent Splitting under Femtosecond Laser Irradiation

Chen¹,

Guo²,

Pan³

et al. 2022

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Laser-induced periodic surface structures (LIPSSs) on various materials have been extensively investigated because of their wide applications. The combination of different materials allows for greater freedom in tailoring their functions and achieving responses not possible in a homogeneous material. By utilizing a femtosecond (fs) laser to irradiate the Fe-doped Polyvinyl Pyrrolidone (PVP) composite film, highly regular ultrafine nanogratings (U-nanogratings) with a period as small as 35.0 (± 2.0) nm can be self-organized on the surface with extremely high efficiency. The period of the U-nanogratings can be controlled by varying the scanning speed of the laser beam (deposited energy) and the thickness of the composite film. Based on the experimental, theoretical, and simulation results, we propose a two-step formation mechanism: composite film excitation and two sequent grating-splitting. The high photosensitivity and low glass transition temperature of the composite film facilitate the fabrication of the ultrafine nanostructures. The proposed design method for the composite material and fabrication process could not only provide a strategy for obtaining highly regular U-nanogratings, but also offer a platform to explore the interaction physics between ultra-short pulses and matter under extreme conditions.

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Section: The Formation Mechanism Of the C-nanogratingsmentioning

confidence: 99%

Section: The Formation Mechanism Of the C-nanogratingsmentioning

confidence: 99%