Design and synthesis of imino alcohol decorated graphene oxide nanosheets as an electrode material for sensor applications

Thushara, K.M.; Ponraj, Mano Ranjana; Muralkar, Pavankumar; Subramani, Naveenkumar; Balasubramaniyan, Nandha Gopal; Balakrishnan, A.; Kumar, W.

doi:10.1016/j.matpr.2022.01.224

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…The D band corresponds to the breathing mode of κ-point photons of A 1g symmetry, and the G band corresponds to the first-order scattering of the E 2g photons of sp 2 carbon atoms. 44,45 After the carboxylation process, the positions for the D and G bands of GO−COOH did not show significant changes. However, the ratio of D to G band intensities (I D /I G ) increased from 2.34 to 2.99 after the carboxylation, which indicated that the average size of the inplane sp 2 domain decreased while large amounts of sp 3 carbon atoms had reverted to sp 2 carbon atoms, resulting in the restoration of the electronic conjugation of GO−COOH.…”

Section: Characterization Of Go and Go−coohmentioning

confidence: 98%

Carboxyl Graphene Oxide Functionalized Cotton Textile with Superwettable Patterns for Humidity Sensing

Guo

Bao

Mao

et al. 2022

ACS Appl. Nano Mater.

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In this study, a carboxyl-modified graphene oxide (GO–COOH) was prepared and deposited into flexible superwettable patterned cotton (SPC) for humidity sensing. The morphology of the as-prepared electronic-SPC (ESPC) was characterized by field emission scanning electron microscopy (FESEM). The carboxylation process was investigated by comparing the chemical properties of GO–COOH and the unmodified GO via X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared, and Raman. The as-prepared ESPC was then applied for humidity sensing for the first time, whereby the GO–COOH impregnated into the superwettable patterns of SPC played an important role. The as-prepared ESPC processed a high sensitivity for humidity sensing with a quite short response time (less than 1 s at ΔRH of 60%) and the output current increased with increasing relative humidity (ΔRH). The output current was affected by the thickness of the GO–COOH layer, which could be controlled by varying the effective area (diameter of the dots) as well as the loading amount (concentration of GO–COOH). The as-prepared ESPC showed high stability and durability whereby the output current did not show a significant change after overnight washing. Meanwhile, the high flexibility of ESPC was confirmed by the bending test, and results showed that it could maintain an output current of 25 nA even after 2000 bending cycles. The high performance noncontact ESPC was further applied in human breathing sensing test and the results showed that the ESPC could be a promising material for wearable health monitoring.

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Section: Characterization Of Go and Go−coohmentioning

confidence: 98%

Carboxyl Graphene Oxide Functionalized Cotton Textile with Superwettable Patterns for Humidity Sensing

Guo

Bao

Mao

et al. 2022

ACS Appl. Nano Mater.

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“…In the case of miniemulsion polymerization, the amphiphilicity of GO has been explored to stabilize polymer particles in aqueous dispersions. ,− In such aqueous dispersions, maintaining the colloidal stability during the reduction of GO remains a challenge. To circumvent this problem, surface-functionalized GO has been explored based on the notion that surface functionalization will aid in maintaining colloidal stability. − However, these strategies have led to mixed results in terms of electrical properties . Functionalization of GO or rGO intrinsically compromises its innate properties and therefore, ideally neat GO is preferred instead of functionalized GO in aqueous polymer/GO nanocomposite dispersions.…”

Section: Introductionmentioning

confidence: 99%

Maintaining Colloidal Stability of Polymer/Reduced Graphene Oxide Nanocomposite Aqueous Dispersions Produced via In Situ Reduction of Graphene Oxide for the Preparation of Electrically Conductive Coatings

Maslekar

Fadil

Zetterlund

et al. 2023

ACS Appl. Nano Mater.

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Chemical reduction of graphene oxide (GO) in an aqueous polymer/GO dispersion invariably causes restacking and precipitation of reduced GO (rGO) sheets leading to spontaneous phase separation. This has been a significant challenge limiting the commercial production of aqueous polymer/rGO paints and coatings. In this study, we developed in situ reduction strategies to chemically reduce GO while maintaining the colloidal stability of an aqueous polymer/rGO dispersion. An aqueous polymer/GO latex was prepared using miniemulsion polymerization, which was subsequently reduced in situ using four different chemical reducing agents (hydroiodic acid, sodium borohydride, ascorbic acid, and hydrazine hydrate) to obtain colloidally stable polymer/rGO dispersions. The reduction of GO was confirmed using X-ray photoelectron spectroscopy (XPS), Raman, and X-ray diffraction (XRD). The colloidal stability of the reduced dispersions was maintained for over 6 months under ambient storage conditions. Stable polymer/rGO dispersions were drop cast to form nanocomposite films at ambient temperature. Finally, the electrical conductivity measurement of polymer/rGO films revealed the highest conductivity for hydrazine hydrate-reduced films (∼6.6 S m −1 ), which was marginally higher than for hydroiodic acidreduced films (∼3.4 S m −1 ). The electrical conductivity of sodium borohydride-and ascorbic acid-reduced films was two orders of magnitude lower than for hydrazine hydrate-and hydroiodic acid-reduced films. Overall, the present results pave a path for the commercial production of colloidally stable aqueous polymer/rGO composite paints and coatings.

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Fabrication of high-performance asymmetric supercapacitor using hybrid niobium (V) oxide anchored La2O3 nanocomposite for high energy density performance

Saravanakumar,

Vijayalakshmi

2024

Ionics

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Design and synthesis of imino alcohol decorated graphene oxide nanosheets as an electrode material for sensor applications

Cited by 3 publications

References 26 publications

Carboxyl Graphene Oxide Functionalized Cotton Textile with Superwettable Patterns for Humidity Sensing

Carboxyl Graphene Oxide Functionalized Cotton Textile with Superwettable Patterns for Humidity Sensing

Maintaining Colloidal Stability of Polymer/Reduced Graphene Oxide Nanocomposite Aqueous Dispersions Produced via In Situ Reduction of Graphene Oxide for the Preparation of Electrically Conductive Coatings

Fabrication of high-performance asymmetric supercapacitor using hybrid niobium (V) oxide anchored La2O3 nanocomposite for high energy density performance

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