研究目的
To investigate the possibilities of creating high-density tracks in polymer matrices with the help of high-energy helium and hydrogen ion beams and synthesizing track polymer templates suitable for the nanoindustry, including the development of methods for synthesizing track polymer templates with disperse and regular distributions of through pores and their utilization in creating nanostructured columnar structures on the surface of different materials.
研究成果
Track polymer templates with pore diameters of 50–200 nm and high porosity (up to 2 × 10^13 pore/cm2) were successfully synthesized using high-energy ion irradiation and chemical etching. These templates were used to create metallic membranes for hydrogen filtering, pointed cathodes for MIM structures with enhanced performance, and regular silicon templates for lithography. The method offers advantages over standard lithographic techniques and has broad applications in electronics, medicine, and chemistry.
研究不足
The pore distribution in templates can be nonuniform, requiring irradiation through masks for regularity. High filling speeds in electrochemical deposition can clog pores, and careful control of voltage is needed to avoid issues like hydrogen bubble formation. The thickness and material properties of polymers limit the types of ions that can be used effectively.
1：Experimental Design and Method Selection:
The study involves irradiating polymer films (PETP and PP) with high-energy ions (helium, hydrogen, argon) using a cyclotron, followed by chemical etching to create track templates. Methods include calculations of ion paths and energy losses using the Bethe-Bloch formula and SRIM program, and techniques such as deep X-ray lithography with synchrotron radiation for regular template manufacturing.
2：Sample Selection and Data Sources:
Polymer samples include polyethylene terephthalate (PETP) and high-pressure polypropylene (PP) films with thicknesses of 50 μm, oriented along two axes. Samples are irradiated and etched to form templates.
3：List of Experimental Equipment and Materials:
Equipment includes a classical cyclotron at Tomsk Polytechnic University, Mettler Toledo T50 titrator for solution monitoring, ZIVE SP2 impedance potentiostat for electric resistance measurement, SSP-310 spectrophotometer for optical density, NT-MDT atomic-force microscope, Hitachi 1000 scanning electron microscope (SEM), VUP-5 setup for thermal deposition, and devices for electrochemical deposition and lithography. Materials include PETP, PP, alkaline and acid solutions with catalysts, silicon plates, polyimide, gold, nickel, copper, and stainless steel.
4：Experimental Procedures and Operational Workflow:
Samples are irradiated with ions (e.g., 28-MeV helium ions,
5：7-MeV protons, 5-MeV argon ions) through a mask or directly, followed by etching in ultrasonic baths with controlled solutions. Templates are used for electrochemical or thermal deposition of metals to form nanostructures. Procedures include measuring electric resistance and optical density before and after irradiation, and using SEM and AFM for characterization. Data Analysis Methods:
Data analysis involves calculating ion paths and energy losses, monitoring solution concentration, and using microscopy to assess pore size, distribution, and nanostructure morphology.
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