X-ray Radiation Effects on SWCNT/PMMA Thin Film Nanocomposites

Suman, Guddi K.; Pulikkathara, Merlyn; Wilkins, R.

doi:10.1109/tnano.2021.3080624

Cited by 3 publications

(9 citation statements)

References 25 publications

(47 reference statements)

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“…The SWCNT/PMMA nanocomposite thin films were irradiated with X-rays at different dose rates to a total dose of 100 krad. The observed results were compared with previous work with devices using unfunctionalized SWCNT/PMMA thin films [29]. As observed in previous work, a decrease in the resistance of the thin film was measured during X-ray exposure with the higher response of ferrocene-doped SWCNT/PMMA film at a lower X-rays dose rate as compared with unfunctionalized SWCNT/PMMA films.…”

Section: Introductionsupporting

confidence: 69%

“…Ferrocene, an organometallic compound, N, N-Dimethylformamide (DMF) (319937)), and PMMA (182230) were purchased from Sigma Aldrich. PMMA was chosen as the polymer for fabricating thin films in this study because of its good spinning qualities [30], solubility in DMF [29], its amorphous character (thereby avoiding crystallization during the cooling process) [31], high weatherability (durability) [32], and good chemical resistance [33]. While X-rays are known to damage PMMA [34] more than other polymers, PMMA was chosen for our work to facilitate device fabrication for the reasons given above.…”

Section: Materials For the Fabrication Of The Nanocompositementioning

confidence: 99%

“…The functionalized SWCNT/PMMA nanocomposite thin film (carboxylic acid, coppercoated) was prepared in the same manner as the unfunctionalized SWCNT/PMMA film [29] and the MWCNT nanocomposites were studied in ref. [27].…”

Section: Functionalized Swcnt/pmma Nanocomposite Thin Film Preparatio...mentioning

confidence: 99%

“…Unfunctionalized MWCNT, functionalized MWCNT, and unfunctionalized SWCNT thin films showed a directly proportionate response to applied X-ray doses and dose rates [26,27,29]. The functionalized MWCNT thin film showed a higher response to X-rays than unfunctionalized MWCNTs.…”

Section: Introductionmentioning

confidence: 96%

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Ionizing Radiation Sensing with Functionalized and Copper-Coated SWCNT/PMMA Thin Film Nanocomposites

Suman,

Pulikkathara,

Wilkins

et al. 2023

Nanomaterials

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This paper studies the ionizing radiation effects on functionalized single-walled carbon nanotube (SWCNT)/poly(methyl methacrylate) (PMMA) thin-film nanocomposites [SWNT/PMMA]. The functionalized thin-film devices are made of ferrocene-doped SWCNTs, SWCNTs functionalized with carboxylic acid (COOH), and SWCNTs coated/ modified with copper. The nanocomposite was synthesized by the solution blending method and the resulting nanocomposite was spin-cast on interdigitated electrodes (IDEs). A 160 kV X-ray source was used to irradiate the thin film and changes in the electrical resistance of the nanocomposites due to X-rays were measured using a semiconductor device analyzer. Carboxylic acid functionalized and copper-coated SWCNT/PMMA nanocomposite showed a reduced response to X-rays compared to unfunctionalized SWCNT/PMMA nanocomposite. Ferrocene-doped SWCNT showed a higher sensitivity to X-rays at lower dose rates. This is in contrast to a previous study that showed that similar nanocomposites using functionalized multi-walled CNTs (MWCNTs) had demonstrated an improved response to X-rays ionizing radiation compared to unfunctionalized MWCNTs for all dose rates. Electrical measurements were also performed using the Arduino Nano microcontroller. The result showed that a relatively economical, lightweight-designed prototype radiation sensor based on SWCNT/PMMA thin-film devices could be produced by interfacing the devices with a modest microcontroller. This work also shows that by encapsulating the SWCNT/PMMA thin-film device in a plastic container, the effect of ambient humidity can be reduced and the device can still be used to detect X-ray radiation. This study further shows that the sensitivity of SWCNT to X-rays was dependent on both the functionalization of the SWCNT and the dose rate.

show abstract

Section: Introductionsupporting

confidence: 69%

Section: Materials For the Fabrication Of The Nanocompositementioning

confidence: 99%

Section: Functionalized Swcnt/pmma Nanocomposite Thin Film Preparatio...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Ionizing Radiation Sensing with Functionalized and Copper-Coated SWCNT/PMMA Thin Film Nanocomposites

Suman,

Pulikkathara,

Wilkins

et al. 2023

Nanomaterials

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“…Also, theoretical and experimental studies have been reported on SW-CNTs with various diameter-dependent properties such as chiral wrapping, stability, molecular dynamics, strength, and stiffness [24,25]. Thus, composites of PS and SW-CNTs with different diameters can be applied in many radiation fields such as radiation shielding, radiation sensors, and oil-absorbing membranes [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Effect of SW-CNT Diameter on Polymer Degradation and Resistance of Polystyrene/SW-CNTs Composites Induced by γ-Irradiation

et al. 2022

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The outstanding electrical, mechanical, and thermal properties of carbon nanotubes (CNTs) make them promising materials for a wide range of applications. Numerous theoretical and experimental studies on the diameter-dependent properties of single-walled carbon nanotubes (SW-CNTs) exist. The incorporation of carbon nanotubes into commercial polymers can alter the properties of both materials. Herein, we demonstrate polystyrene/SW-CNT composites with different diameters to check property changes, including radiation-protective characteristics under various doses of gamma radiation. The intrinsic glassy state of polystyrene disappeared owing to the introduction of SW-CNTs into the polymer-polymer chain. In addition, when 1.3 nm diameter SW-CNTs were introduced, the Fourier-transform infrared spectroscopy peaks for alkyl aryl ethers were observed at 10–60 kGy of gamma irradiation. In this study, the different phenomena that occur when polystyrene/SW-CNT composites are formed with different SW-CNT diameters (0.78 nm and 1.3 nm) were investigated via systematic analyses.

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Metallization considerations for carbon nanotube device optimization

Farmer¹

2022

Journal of Applied Physics

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As a one-dimensional structure with atomically thin sidewalls, charge transport in carbon nanotubes can be regarded as a surface phenomenon. As such, perturbations from the surrounding environment can have a dramatic impact on transport and consequently on the device behavior of carbon nanotube field-effect transistors (CNTFETs). Importantly, this includes effects from device fabrication processes like contact metallization. With this as motivation, several aspects of contact metallization are investigated herein. First, it is found that ON current in n-type CNTFETs is enhanced to the level of p-type CNTFETs through the utilization of titanium as an adhesion layer, a result of improved wetting. Effects of different metallization techniques, namely, thermal and electron-beam evaporation, are also explored in p-type devices using titanium/palladium/gold contacts. It is found that thermal metallization consistently produces devices with higher ON current. In-depth analysis of the transfer characteristics reveals that this is due to radiation effects encountered during electron-beam processing, resulting in channel scattering and a decreased transconductance in the devices. This effect is particularly severe upon gold processing, and attempts to heal this device degradation through annealing proved unsuccessful. All studies presented here are conducted through the analysis of a large number of nanotube devices, giving a degree of confidence to the average results. Additionally, only device parameters that can be directly extracted from the transfer characteristics are analyzed. Assumptions including nanotube diameter, capacitance, and nanotube number per device are not made. Results from this study provide recommendations for optimizing CNTFET performance as it relates to contact metallization.

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X-ray Radiation Effects on SWCNT/PMMA Thin Film Nanocomposites

Cited by 3 publications

References 25 publications

Ionizing Radiation Sensing with Functionalized and Copper-Coated SWCNT/PMMA Thin Film Nanocomposites

Ionizing Radiation Sensing with Functionalized and Copper-Coated SWCNT/PMMA Thin Film Nanocomposites

Effect of SW-CNT Diameter on Polymer Degradation and Resistance of Polystyrene/SW-CNTs Composites Induced by γ-Irradiation

Metallization considerations for carbon nanotube device optimization

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