Thermoluminescent properties of ZnS:Mn nanocrystalline powders

Ortiz-Hernandez, Arturo Agustin; García, Víctor Hugo Méndez; Arrieta, M.; Ortega, J.J.; Araiza, J. J.; Vega-Carrillo, Héctor René; Falcony, C.

doi:10.1016/j.apradiso.2015.02.006

Cited by 11 publications

(2 citation statements)

References 19 publications

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“…Since smaller particles have more accessible TL carriers than larger particles because of a larger surface/volume ratio and more surface states, we tested whether ZnS particles that are agglomerates of ZnS nanoparticles could convert heat to radiation, thereby reducing the CTE of nanocomposite films. Figure shows that the TL intensity of ZnS particles was zero without β-radiation and that the TL peak intensity increased with increasing β-radiation dose, because increasing β-radiation dose induces formation of new defect sites inside ZnS particles and hence allows additional electron traps. , Note that even the nanocomposite film with the β-radiated ZnS particles showed a very low TL intensity, indicating that TL from the ZnS particles is negligible. The TL results suggest that reduction in CTE of the ZnS/PI nanocomposite was not caused by the TL property of the ZnS particles.…”

Section: Resultsmentioning

confidence: 93%

“…Figure 6 shows that the TL intensity of ZnS particles was zero without β-radiation and that the TL peak intensity increased with increasing β-radiation dose, because increasing β-radiation dose induces formation of new defect sites inside ZnS particles and hence allows additional electron traps. 27,28 Note that even the nanocomposite film with the β-radiated ZnS particles showed a very low TL intensity, indicating that TL from the ZnS particles is negligible. The TL results suggest that reduction in CTE of the ZnS/PI nanocomposite was not caused by the TL property of the ZnS particles.…”

Section: Methodsmentioning

confidence: 99%

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Reducing the Coefficient of Thermal Expansion of Polyimide Films in Microelectronics Processing Using ZnS Particles at Low Concentrations

Jeon

Yoon

Song

et al. 2018

ACS Appl. Nano Mater.

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We report a reduction in the coefficient of thermal expansion (CTE) of polyimide (PI) film in microelectronics processing by using ZnS particles as nanofillers. To prevent agglomeration of ZnS particles, the surfaces of ZnS particles were modified with the (3-mercaptopropyl)trimethoxysilane, creating surface hydroxyl groups. For means of comparison, SiO2 and ZrW2O8 particles that have widely been studied as fillers for various polymer films were also synthesized. The CTE measurements showed that the ZnS particles produced PI nanocomposite film with a much lower CTE than either SiO2 or ZrW2O8 particles at the same concentration. In particular, the surface-modified ZnS particles showed the lowest CTE (13 ppm/K) at 15 wt %, which is comparable to the largest percentage decrease (70%) in CTE from the bare-PI film to date at a much lower particle concentration. To rationalize the significant reduction in CTE with the surface-modified ZnS particles, we considered the intrinsic CTE and thermal conductivity, thermoluminescence property, interfacial area, and dispersion state of ZnS particles, and found that the intrinsic thermal conductivity and dispersion state of ZnS particles were mainly responsible for the reduction in CTE at low particle concentration. Finally, we demonstrated that the optical and mechanical properties of the PI nanocomposite films containing surface-modified ZnS particles at 15 wt % were comparable to those of the bare-PI film.

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Section: Resultsmentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%