探究 PET 薄膜 32S 核径迹的热退火效应

京京 李

摘要


PET 薄膜中的 32S 核径迹在经受温度高于材料玻璃化转变温度的热处理后，会出现热退火现象。热退火效应会使径迹蚀刻速率发生改变，可以改变核径迹蚀刻微孔的形状。本工作通过使用扫描电子显微镜（SEM）观测样品的蚀刻微孔形貌，研究 PET 薄膜中 32S 核径迹的热退火效应。选用厚度 25μm 的 PET 薄膜，使用能量为 113.7MeV 的 32S 重离子束在低真空靶室中对其进行均匀辐照，对辐照样品进行一系列不同温度和时长的热处理后，使用常规双面蚀刻法在温度 65℃、浓度 5mol/L的 NaOH 水溶液中蚀刻 180min，制成核径迹微孔膜样品并使用通过方法观察核径迹蚀刻微孔的形貌。一种方法是使用电子显微镜直接观察核径迹微孔膜，未热处理样品的微孔最大，110℃、130℃、170℃热处理样品的微孔依次变小。蚀刻微孔的变化表明热处理使核径迹退火，热处理温度越高退火越快。另一种方法是将核径迹微孔膜作为模板，使用电化学镀沉积制备纳米线的方法在核径迹微孔中沉积铜，制备复制核径迹蚀刻微孔形貌的铜样品，然后使用扫描电子显微镜观察铜样品。铜样品表面观察看到复刻了半个核径迹微孔形貌的微小圆锥，未进行热处理样品对应的微锥最大，130℃和 170℃热处理样品的对应的微锥依次变小，与直接观察核径迹蚀刻微孔形貌结果一致。

关键词


核径迹；退火；热处理；化学蚀刻

全文:

PDF

参考


YOUNG D A. Etching of radiation damage in lithium fluoride[J]. Nature,1958(182):375-377.

DVORYASHIN A M, KOSAREV S A, TU-MANOV A A, et al. Track length distribution of U-235 fission fragments in Lavsan films[J]. Atomic Energy,2004,96(4):282-286.

P Iza, L S Farenzena, T Jalowy, K O Groeneveld, et al. Secondary ion emission dynamics model: A tool for nuclear track analysis[J]. Nuclear Inst. and Methods in Physics Research,2006,245(1).

AFRA B, LANG M, RODRIGUEZ M, et al. Annealing kinetics of latent particle tracks in Durango apatite[J]. Physical Review B,2011(83):64116.

FARID S M. Annealing of heavy ion tracks in cellulose nitrate plastic track detectors[J]. Pramana,1985,25(3):259-265.

MO D, LIU J D, DUAN J L, et al. Fabrication of different pore shapes by multi-step etching technique in ion-irradiated PET membranes[J]. Nuclear Instruments and Methods in Physics Research B,2014(333):58-63.

Fleischer R L, Price P B, Walker R M. Effects of temperature, pressure, and ionization of the formation and stability of fission tracks in minerals and glasses[J]. J Geophys Res,1965,70(6):1497- 1502.

Ketcham R A, Donelick R A, Carlson W D. Variability of apatite fission-track annealing kinetics: III. Extrapolation to geological time scales[J]. Am Mineral,1999,84(9):1235-1255.

Li Weixing, Cheng Yuanyuan, Feng Lei, et al. Alpha-decay induced shortening of fission tracks simulated by in situ ion irradiation[J]. Geochimica et Cosmochimica Acta,2021:299.

H A Khan, N A Khan, K Jamil, et al. Annealing of heavy ion latent damage trails in muscovite mica and CR-39 plastic track detectors[J]. Nuclear Tracks and Radiation Measurements(1982),1984,8(1-4).

D A Syrtsova, V V Teplyakov, Yu K Kochnev, et al. Structure and properties of poly(4-methylpentene-1) track-etched membranes[J]. Petroleum Chemistry,2016,56(4).

吴振东,梁海英,等.PET薄膜中32S离子径迹的热退火效应[J].原子能科学术,2019,53(11):2302-2308.




DOI: https://doi.org/10.12346/etr.v5i3.7803

Refbacks

  • 当前没有refback。