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Resistive and Capacitive γ-Ray Dosimeters Based On Triggered Depolymerization in Carbon Nanotube Composites
ACS Sensors ( IF 8.2 ) Pub Date : 2018-03-20 00:00:00 , DOI: 10.1021/acssensors.8b00108
Lukas Zeininger 1 , Maggie He 1 , Stephen T Hobson 2 , Timothy M Swager 1
Affiliation  

We report γ-ray dosimeters using carbon nanotubes wrapped with metastable poly(olefin sulfone)s (POSs) that readily depolymerize when exposed to ionizing radiation. New POSs, designed for wrapping single-walled carbon nanotubes (SWCNTs), are synthesized and characterized. The resulting POS-SWCNT composites serve as the active transducer in a novel class of γ-ray dosimeters. In our devices, polymer degradation results in immediate changes in the electronic potential of the POS-SWCNT active layers by decreasing the electron tunneling barriers between individualized tubes and by creating enhanced cofacial π–π electron contacts. By incorporating the SWCNT-POS composites into small resistive device platforms, we establish a rare example of real-time detection and dosimetry of radioactive ionizing radiation using organic-based materials. We show that the sensitivity of our platform closely depends on the intrinsic stability of the polymer matrix, the opacity toward γ-rays, and the dispersion efficiency (i.e., the individualization and isolation of the individual SWCNT charge carriers). Resistance decreases up to 65% after irradiation with a 40 krad dose demonstrates the high sensitivity of this novel class of γ-ray sensors. In addition, the detection mechanism was evaluated using a commercial capacitive device platform. The ease of fabrication and low power consumption of these small and inexpensive sensor platforms combined with appealing sensitivity parameters establishes the potential of the poly(olefin sulfone)-SWCNT composites to serve as a new transduction material in γ-ray sensor applications.

中文翻译:

基于碳纳米管复合材料触发解聚的电阻式和电容式 γ 射线剂量计

我们报告了γ射线剂量计,使用包裹有亚稳态聚烯烃砜(POS)的碳纳米管,当暴露于电离辐射时,该碳纳米管很容易解聚。合成并表征了专为包裹单壁碳纳米管 (SWCNT) 而设计的新型 POS。由此产生的 POS-SWCNT 复合材料可作为新型 γ 射线剂量计中的有源传感器。在我们的器件中,聚合物降解通过减少个体管之间的电子隧道势垒并创建增强的共面 π-π 电子接触,导致 POS-SWCNT 活性层的电子势立即发生变化。通过将 SWCNT-POS 复合材料整合到小型电阻器件平台中,我们建立了使用有机材料实时检测和剂量测定放射性电离辐射的罕见示例。我们表明,我们平台的灵敏度密切取决于聚合物基体的固有稳定性、对 γ 射线的不透明度以及分散效率(即单个 SWCNT 电荷载流子的个体化和隔离)。在 40 krad 剂量照射后,电阻下降高达 65%,这证明了此类新型 γ 射线传感器的高灵敏度。此外,还使用商业电容设备平台评估了检测机制。这些小型且廉价的传感器平台易于制造、功耗低,再加上有吸引力的灵敏度参数,确立了聚(烯烃砜)-SWCNT 复合材料在 γ 射线传感器应用中作为新型转导材料的潜力。
更新日期:2018-03-20
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