Modification in adsorption properties of graphene during the development of viral biosensors

Eliseyev, I. A.; Гущина, Е. А.; Клотченко, С. А.; Лебедев, А. А.; Lebedeva, Nadezhda; Lebedev, S. P.; Нащекин, А. В.; Petrov, V. N.; Пузык, М. В.; Roenkov, A. D.; Smirnov, A. N.; Tanklevskaya, E. M.; Usikov, A.; Шабунина, Е. И.; Schmidt, N. M.

doi:10.21883/sc.2022.12.55150.4429

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…This wide green PL band is also attributed to carbon vacancies and their extended point defects in unintentionally doped 4H-SiC homoepitaxial layers [15]. The most likely recombination pathway for this PL is frequently linked with nitrogen donor-acceptor pairs (DAPs) with a structural defect [16]. Figure 2(b) shows that the DAP intensity (420-600 nm) decreases with fluence for both Ag and He ion irradiations.…”

Section: Methodsmentioning

confidence: 95%

100 Mev Ag and 25 Kev He Induced Defects in 4H-SiC

Chakravorty¹,

Kabiraj²

2022

ECS Trans.

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We demonstrate the formation of radiative defects, known as color centres, in 100 MeV Ag and 25 keV He irradiated semi-insulating 4H-SiC using low-temperature (~77 K) photoluminescence (PL). In PL, the luminescence resulting from radiative recombination of photo-excited carriers (electrons and holes) is studied. In our work, a 266 nm deep UV excitation source is utilized for performing PL measurements. In the range, 850-1150 nm, the photoluminescent peaks ascribed to silicon vacancies (V Si) and unknown defect-related bands (UD3 and UD4) are observed after both ion irradiations. It has also been observed that till an optimum irradiation fluence there is an enhancement of photoluminescence from the ion irradiation-induced defects but further increase in irradiation fluence results in accumulation of photo-absorbing defects, providing pathways for non-radiative processes. In addition, ion irradiation has been shown to suppress the undesirable luminescence in the range 300-600 nm caused by the intrinsic defects in as-grown 4H-SiC.

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Section: Methodsmentioning

confidence: 95%

100 Mev Ag and 25 Kev He Induced Defects in 4H-SiC

Chakravorty¹,

Kabiraj²

2022

ECS Trans.

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“…Otras investigaciones determinaron que la resistencia del ligante bituminoso 60/90 con adición de cenizas volantes de alto calcio(FA1) es mayor que la del ligante bituminoso con adición de cenizas volantes de bajo calcio(FA2) a 20 °C, 0 °C y 50 °C siendo 4.02, 6.77 y 0.87 MPa con FA1 y 3.20, 5.86 y 0.74 MPa para FA2, gracias a la mayor densidad de los sólidos en el ligante bituminoso modificado con FA1. Las variaciones de resistencia están entre el 16%-20% [19].…”

Section: Módulo De Resistenciaunclassified

“…En los últimos tiempos, la industria de la construcción se enfrenta a la inestabilidad de las reservas energéticas, sabiendo que el espacio de las carreteras asciende en todo el mundo [19], por ello muchos investigadores para hacer frente a esta problemática se plantean cuestiones como: "¿Existirá materia alternativa al betún de petróleo?" y "¿cuáles son los efectos de beneficio?"…”

Section: Introductionunclassified

Revisión sistemática del comportamiento convencional y reológico del biocompuesto asfalto-biomasas producidas

2023

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La ingeniería de pavimentos, busca con ahínco materiales no petrolíficos como sustituyentes/mejoradores del asfalto. La producción de bioasfalto con biomasa es la técnica más usual con beneficios económicos, sociales y medioambientales. Este documento tiene como objetivo realizar una revisión literaria del mejoramiento del asfalto con biomasa en subproductos de biocarbón o bioaceite. Se efectuó una revisión de 80 artículos científicos, los cuales estudiaron las propiedades convencionales y reológicas del asfalto con porcentajes óptimos de adición de biomodificadores, considerándolos como nuevas tecnologías en las construcciones viales. Los resultados muestran que la dosis y tipo del biomaterial influye mucho como modificador, dado que el rendimiento del bioasfalto a base de biomasa garantiza reacciones positivas con una mínina adición de 1% de aceite de palma hasta 100% de ceniza de madera como máximo. En conclusión, a mayor dosis de biomodificador a altas temperaturas mayor es la mejora en la viscosidad, estabilidad, grado de penetración, punto de reblandecimiento, resistencia a la tracción indirecta, módulo de resistencia, resistencia a la deformación, resistencia a la fatiga, resistencia al deslizamiento y resistencia a la humedad del asfalto, además de tener mejores condiciones de envejecimiento oxidativo, pues generalmente el ligante asfáltico es compatible con la mayoría de los biomateriales, siendo viable como fuente de energía renovable, sostenible y de calidad.

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Quality Assessment of Processed Graphene Chips for Biosensor Application

et al. 2023

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The quality of graphene intended for use in biosensors was assessed on manufactured chips using a set of methods including atomic force microscopy (AFM), Raman spectroscopy, and low-frequency noise investigation. It is shown that local areas of residues on the graphene surface, formed as a result of the interaction of graphene with a photoresist at the initial stage of chip development, led to a spread of chip resistance (R) in the range of 1–10 kOhm and to an increase in the root mean square (RMS) roughness up to 10 times, which can significantly worsen the reproducibility of the parameters of graphene chips for biosensor applications. It was observed that the control of the photoresist residues after photolithography (PLG) using AFM and subsequent additional cleaning reduced the spread of R values in chips to 1–1.6 kOhm and obtained an RMS roughness similar to the roughness in the graphene film before PLG. Monitoring of the spectral density of low-frequency voltage fluctuation (SU), which provides integral information about the system of defects and quality of the material, makes it possible to identify chips with low graphene quality and with inhomogeneously distributed areas of compressive stresses by the type of frequency dependence SU(f).

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Modification in adsorption properties of graphene during the development of viral biosensors

Cited by 4 publications

References 18 publications

100 Mev Ag and 25 Kev He Induced Defects in 4H-SiC

100 Mev Ag and 25 Kev He Induced Defects in 4H-SiC

Revisión sistemática del comportamiento convencional y reológico del biocompuesto asfalto-biomasas producidas

Quality Assessment of Processed Graphene Chips for Biosensor Application

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