Effects of graphene layer and gold nanoparticles on sensitivity of humidity sensors

Bao, Jiawei; Hashemi, Nooshin; Guo, Jingshuai; Hashemi, Nastaran

doi:10.1177/2516598419896130

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…A high theoretical specific surface area of 2630 m 2 g −1 , intrinsic mobility of 200 000 cm 2 v −1 s −1 , and thermal conductivity of approximately 5000 W m −1 K −1 have been reported for such structures [2][3][4]. Based on the excellent conductivity of Graphene nanosheets [5], this nanostructure has been employed in studying of neurodegenerative diseases and the electrophysiological effects on cells to find other unknown molecular pathways [6][7][8] and to develop useful biosensors for Parkinson's disease, neurotoxicity, oxidative stress, histone deacetylase, and monitoring of body sweat [9,10].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic cavitation for scalable exfoliation of few-layered graphene nanosheets

et al. 2021

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A simple method for protein assisted scalable exfoliation of biocompatible few layered graphene (FLG) nano-sheets is developed using hydrodynamic cavitation. Hydrodynamic cavitation is used for the exfoliation. Unlike acoustic cavitation, the primary way of bubble collapse in hydrodynamic cavitation is caused laterally, thereby separating two adjacent flakes by a shear effect. The process utilizes a known protein, Bovine Serum Albumin (BSA), which acts as an effective exfoliation agent and provides stability by preventing restacking of the graphene layers.Development of potentially scalable biocompatible methods are critical for producing costeffective non-toxic graphene, enabling numerous possible biomedical and biological applications. A methodical study was performed to identify the effect of time in a novel hydrodynamic cavitation system for graphene exfoliation. The fabricated product was characterized using Raman spectroscopy and Transmission electron microscopy. It was found 9 that with time the number of layers of graphene seem to decrease based on the I2D/IG ratio where at 6 hours the ratio was at 0.307 but along with that disorder in graphene seem to increase based on the ID/IG ratio which reached up to .33 from .25 at 4.5 hours. The paper also provides the theoretical and the computational analysis needed to create an optimized cavitation model to potentially improve the graphene yield and fabricate higher quality graphene.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic cavitation for scalable exfoliation of few-layered graphene nanosheets

et al. 2021

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“…11(a). This approach has the potential to modify the sensitivity of the developed chip [64]. As a theoretical analysis derived from the optoelectronic viewpoint to understand better, gold nanoparticles, compared to the other particles, have high stability and functionality in addition to biocompatibility.…”

Section: Characterization Of the Myelinated Axon By Graphene Photonic...mentioning

confidence: 99%

Optical Modeling and Characterization of Demyelinated Nerve Using Graphene-Based Photonic Structure

et al. 2022

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The myelin sheath, as an insulation layer in nerve cells, plays an essential role in neural communication and signal conduction. Loss of myelin, referred to as demyelination, is associated with many mental disorders. Detecting the tiny demyelinated parts in nerve fibers can provide early diagnosis of some mental disorders and create effective treatment plans. This paper establishes a new engineering approach for differentiation between demyelinated and myelinated axons by analyzing spectral responses resulting from the optical simulation framework. We propose computational modeling on the photonic communication of nerve fibers and develop a graphene-based neurophotonic device that can be used to detect the regions demyelinated on the nerve fiber. We first model a nanoscale thin-film configuration of the multilayered myelinated axon to evaluate photons transmission in the nerve fibers under geometric defects as demyelination. Then, the nerve's optical characteristics are achieved by focusing on the reflectance of light incidence on the nerve model with the change of the demyelination size to distinguish demyelinated-from myelinated nerves by the spectral contrast. Undertaking the different levels of demyelination progression, we theoretically explore the variations of effective refractive index using an analytical solution technique. Ultimately, we design a nanostructure configured with silicon dioxide, graphene, and gold nanoparticles to function as a biochip recognizing myelinated axon damage under the surface plasmon effect. This device can promote a practical procedure to distinguish nanoscale demyelinated and myelinated axons, which can be utilized for neural sensing of tiny brain tissues as a neurophotonic needle.

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“…Despite being the thinnest material present, it has a Young's modulus of approximately 1 TPa making it stronger than steel [7,8]. A variety of fields including biology [9][10][11] and medicine have begun tapping into the immense potential that graphene presents. For example, He et al [12] used graphene as a surface-enhanced Raman scattering (SERS) substrate in order to carry out multiplex DNA detection.…”

Section: Introductionmentioning

confidence: 99%

Protein-assisted scalable mechanochemical exfoliation of few-layer biocompatible graphene nanosheets

et al. 2021

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A facile method to produce few-layer graphene (FLG) nanosheets is developed using protein-assisted mechanical exfoliation. The predominant shear forces that are generated in a planetary ball mill facilitate the exfoliation of graphene layers from graphite flakes. The process employs a commonly known protein, bovine serum albumin (BSA), which not only acts as an effective exfoliation agent but also provides stability by preventing restacking of the graphene layers. The latter is demonstrated by the excellent long-term dispersibility of exfoliated graphene in an aqueous BSA solution, which exemplifies a common biological medium. The development of such potentially scalable and toxin-free methods is critical for producing cost-effective biocompatible graphene, enabling numerous possible biomedical and biological applications. A methodical study was performed to identify the effect of time and varying concentrations of BSA towards graphene exfoliation. The fabricated product has been characterized using Raman spectroscopy, powder X-ray diffraction, transmission electron microscopy and scanning electron microscopy. The BSA-FLG dispersion was then placed in media containing Astrocyte cells to check for cytotoxicity. It was found that lower concentrations of BSA-FLG dispersion had only minute cytotoxic effects on the Astrocyte cells.

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Effects of graphene layer and gold nanoparticles on sensitivity of humidity sensors

Cited by 4 publications

References 27 publications

Hydrodynamic cavitation for scalable exfoliation of few-layered graphene nanosheets

Hydrodynamic cavitation for scalable exfoliation of few-layered graphene nanosheets

Optical Modeling and Characterization of Demyelinated Nerve Using Graphene-Based Photonic Structure

Protein-assisted scalable mechanochemical exfoliation of few-layer biocompatible graphene nanosheets

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