Surface modification of graphene with thionine: Formation of p-n junctions

Sousa, Thiago Alonso Stephan Lacerda de; Santos, Flávio Augusto Portela; Silva, Thais G.; Araújo, Eduardo Nery Duarte de; Plentz, F.

doi:10.1016/j.apsusc.2020.147003

Cited by 10 publications

(3 citation statements)

References 47 publications

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“…Fluorine containing coatings can endow composites with more functionality. , In this work, PDA and PFDT were used to modify nanodiamonds, improving their aggregation and making them hydrophobic. The TEM diagram in Figure S1 shows that the ND has many clearly visible lattice stripes.…”

Section: Resultsmentioning

confidence: 99%

Hydrophobic Nanofiber Cellulose-Graphene Films for High-Performance Thermal Management Applications

Song,

Jin,

jiao

et al. 2024

ACS Appl. Nano Mater.

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With the advent of the 5G era, the requirements for the heat dissipation of microelectronic devices are becoming increasingly high. High thermal conductivity composite polymers often require the addition of more thermally conductive fillers, but the increased number of interfaces can lead to unsatisfactory thermal conductivity performance. In this work, a highly thermally conductive film composed of nanocellulose and PyNH 2 -modified graphene was obtained by evaporation and subsequent hot-pressing. In addition, fluorinated and polydopamine-modified nanodiamonds (F-PDA-ND) were sprayed onto the film to create a hydrophobic layer. Through the improvement of interface interactions, the establishment of graphene orientation structure, and the creation of a hydrophobic layer, the thermal conductivity of the nanocellulose/graphene film can reach 27.06 W•m −1 •K −1 (with 10 wt % PyNH 2 @G content), which is a 21.36-fold increase in thermal conductivity, while also possessing good tensile strength and surface hydrophobic properties. The nanocellulose/graphene thermal conductive film has tremendous potential for applications in the next generation of electronic devices.

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Section: Resultsmentioning

confidence: 99%

Hydrophobic Nanofiber Cellulose-Graphene Films for High-Performance Thermal Management Applications

Song,

Jin,

jiao

et al. 2024

ACS Appl. Nano Mater.

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“…The two current sources were set to 1 μA RMS, 𝑅 𝐴𝐷,𝐵𝐶 was measured at 74.5 Hz and 𝑅 𝐶𝐷,𝐵𝐴 at 133 Hz. We used resistors varying from 10 2 to 10 6 Ω to represent the span of resistance values of typical graphene field-effect transistors [27][28][29]. Table 1 shows the different combinations of 𝑅 1 , 𝑅 2 , 𝑅 3 , and 𝑅 4 as well as the relative deviation between the sequentially and simultaneously measured 4point resistances, calculated by ( 𝑅 𝑠𝑖𝑚 − 𝑅 𝑠𝑒𝑞 ) ∕𝑅 𝑠𝑒𝑞 .…”

Section: Measurements On Test Structuresmentioning

confidence: 99%

Simultaneous Dual-Configuration Van Der Pauw Measurements of Gated Graphene Devices

Pantleon,

Sousa,

Jensen

et al. 2023

Preprint

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“…Conversely, the association of graphene with advanced functional materials, such as monoclonal antibodies and aptamers, for instance, represents a promising route towards the development of next-generation medical platforms for highly sensitive antigen detection [13][14][15][16]. Given its two-dimensional nature and high carrier mobility, graphene is highly responsive to interactions with external agents [17]. Furthermore, sensitive graphene surfaces can be enhanced with specificity for a defined biological target when functionalized with appropriately chosen molecular receptors [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast and highly sensitive detection of SARS-CoV-2 spike protein by field-effect transistor graphene-based biosensors

Sousa,

Almeida,

Santos

et al. 2024

Nanotechnology

Self Cite

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The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), etiological agent for the coronavirus disease 2019 (COVID-19), has resulted in over 775 million global infections. Early diagnosis remains pivotal for effective epidemiological surveillance despite the availability of vaccines. Antigen-based assays are advantageous for early COVID-19 detection due to their simplicity, cost-effectiveness, and suitability for point-of-care testing (PoCT). This study introduces a graphene field-effect transistor-based biosensor designed for high sensitivity and rapid response to the SARS-CoV-2 spike protein. By functionalizing graphene with monoclonal antibodies and applying short-duration gate voltage pulses, we achieve selective detection of the viral spike protein in human serum within 100 μs and at concentrations as low as 1 fg/mL, equivalent to 8 antigen molecules per μL of blood. Furthermore, the biosensor estimates spike protein concentrations in serum from COVID-19 patients. Our platform demonstrates potential for next-generation PoCT antigen assays, promising fast and sensitive diagnostics for COVID-19 and other infectious diseases.

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Surface modification of graphene with thionine: Formation of p-n junctions

Cited by 10 publications

References 47 publications

Hydrophobic Nanofiber Cellulose-Graphene Films for High-Performance Thermal Management Applications

Hydrophobic Nanofiber Cellulose-Graphene Films for High-Performance Thermal Management Applications

Simultaneous Dual-Configuration Van Der Pauw Measurements of Gated Graphene Devices

Ultrafast and highly sensitive detection of SARS-CoV-2 spike protein by field-effect transistor graphene-based biosensors

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