RESUMEN
The bolometer is developed using single-walled carbon nanotubes (SWCNT) anchored with semiconductor nanoparticles of cadmium sulfide, stannous disulfide, and zinc oxide (ZnO). The bolometric responses were recorded at varying temperatures from 10 K to room temperature. The anchored SWCNTs provided a higher temperature coefficient of resistance (TCR) than pristine SWCNTs. The largest TCR is recorded from SWCNTs/ZnO (-0.11%/K) at room temperature, which is 200% higher than pristine SWCNTs. The largest photoresponsivities of SWCNTs/ZnO under near-infrared (NIR) and wide wavelength source (200-1200 nm) illuminations are 5.06 and 37.51 mV/W, respectively. The extraordinary performance of SWCNTs/ZnO stands out at â¼17 × 104% under IR illumination. The study presents a significant advancement in the development of high-performance SWCNT bolometric materials by anchoring with semiconductor nanoparticles.
RESUMEN
Bismuth sulfide (Bi2S3) exhibits a direct energy bandgap and an exceptional optical absorption capability over a broadband radiation, thus presents a novel class of 2D photodetector material. The field effect transistor (FET) photodetector device is fabricated from 2D Bi2S3. An anomalous variation in the transport characteristics of 2D Bi2S3 is observed with the variation in temperature. The electrical resistance reduces by 99.26% at 10 K compared to the response at 300 K. Defects due to the bismuth and sulfur vacancies play a critical role in the dramatic behavior, which is confirmed using photoluminescence, time-resolved photoluminescence, Hall measurements, and energy dispersive X-ray spectroscopy. The density functional theory calculations provide a significant insight into the thermodynamic properties of intrinsic defects in Bi2S3. Moreover, the effect of gate bias on responsivity additionally confirms its invariance at low temperature. The Bi2S3 based FET photodetector achieves ultrahigh responsivity in the order of ≈106 A W-1 and detectivity of ≈1014 Jones. Moreover, the external quantum efficiency of ≈107% is measured in a wide spectrum of optical illumination (532 to 1064 nm) with a noise-equivalent power of 3.5 × 10-18 W/âHz at a bias of 0.2 V. The extraordinary performance of Bi2S3 photodetector outstands 2D photodetectors.
RESUMEN
BACKGROUND: The platelet-rich fibrin (PRF) has proven an immense role in angiogenesis and epithelization in a wound healing process. The present study aims to ascertain PRF's beneficial role in wound healing after depigmentation surgery. MATERIALS AND METHODS: A total of 12 systemically healthy controls included were divided into two groups after scalpel depigmentation procedure. PRF was prepared according to Choukroun's standard protocol. Using split-mouth design after depigmentation, one group received PRF membrane, and in second group non-eugenol periodontal dressing was placed. The participants were evaluated for visual analog scale (VAS), healing index (HI) on 3rd and 5th day. Epithelization test using toluidine blue and histological examination employing punch biopsy was done on the 5th day. RESULTS: On statistical scale, VAS, HI, epithelization test, and histological findings were statistically significant in the two study groups. PRF group proved better epithelization test and inflammatory cell infiltration was less in PRF group which confirmed superior wound healing in the group. CONCLUSION: PRF membrane postdepigmentation provided satisfactory patient comfort and enhanced the wound healing cascade.
