The UV absorption of graphene oxide is size-dependent: possible calibration pitfalls

Zhang, Ting; Zhu, Guanyin; Chen, Yu; Yu, Xianzhong; Xia, Mao; Lu, Boyao; Fei, Xiaofan; Peng, Qiang

doi:10.1007/s00604-019-3329-5

Cited by 59 publications

(25 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, the spectrum also represents a tiny shoulder at around 300 nm ascribed to the n–π* transition of carbonyl groups (COOH) that is consistent with the previous reports [ 34 , 35 ]. Zhang and co-workers [ 36 ] reported that the molar absorbance of GO is size dependent. They represented that the small (hydrodynamic diameter 1 µm), medium (1.5 µm) and large (2.2 µm) sized GO particles display absorbance band at 210, 230 and 250 nm, respectively.…”

Section: Resultsmentioning

confidence: 99%

Antibacterial activity of graphene oxide nanosheet against multidrug resistant superbugs isolated from infected patients

et al. 2020

View full text Add to dashboard Cite

Graphene oxide (GO) is a derivative of graphene nanosheet which is the most promising material of the decade in biomedical research. In particular, it has been known as an antimicrobial nanomaterial with good biocompatibility. In this study, we have synthesized and characterize GO and checked its antimicrobial property against different Gram-negative and Gram-positive multidrug drug resistant (MDR) hospital superbugs grown in solid agar-based nutrient plates with and without human serum through the utilization of agar well diffusion method, live/dead fluorescent staining and genotoxicity analysis. No significant changes in antibacterial activity were found in these two different conditions. We also compare the bactericidal capability of GO with some commonly administered antibiotics and in all cases the degree of inhibition is found to be higher. The data presented here are novel and show that GO is an effective bactericidal agent against different superbugs and can be used as a future antibacterial agent.

show abstract

Section: Resultsmentioning

confidence: 99%

Antibacterial activity of graphene oxide nanosheet against multidrug resistant superbugs isolated from infected patients

et al. 2020

View full text Add to dashboard Cite

show abstract

“…GO presents a strong absorption peak at approximately 230 nm, attributed to the π-π* transitions of aromatic C-C bonds, and a weaker peak at approximately 280 nm, assigned to the n-π* transitions of C=O bonds. After reduction, the peak at 230 nm redshifts to approximately 270 nm, suggesting the restoration of the sp 2 graphene lattice [21][22][23].…”

Section: Evaluation Of the Reduction Extentmentioning

confidence: 99%

Green Carbon Nanostructures for Functional Composite Materials

Barra

Nunes

Ruiz‐Hitzky

et al. 2022

IJMS

View full text Add to dashboard Cite

Carbon nanostructures are widely used as fillers to tailor the mechanical, thermal, barrier, and electrical properties of polymeric matrices employed for a wide range of applications. Reduced graphene oxide (rGO), a carbon nanostructure from the graphene derivatives family, has been incorporated in composite materials due to its remarkable electrical conductivity, mechanical strength capacity, and low cost. Graphene oxide (GO) is typically synthesized by the improved Hummers’ method and then chemically reduced to obtain rGO. However, the chemical reduction commonly uses toxic reducing agents, such as hydrazine, being environmentally unfriendly and limiting the final application of composites. Therefore, green chemical reducing agents and synthesis methods of carbon nanostructures should be employed. This paper reviews the state of the art regarding the green chemical reduction of graphene oxide reported in the last 3 years. Moreover, alternative graphitic nanostructures, such as carbons derived from biomass and carbon nanostructures supported on clays, are pointed as eco-friendly and sustainable carbonaceous additives to engineering polymer properties in composites. Finally, the application of these carbon nanostructures in polymer composites is briefly overviewed.

show abstract

“…Concerning the plexiglass SPIROPLASTIC, the reflection spectra of most radiation in the wavelength range of 400–2000 nm increased by 29% after adding the GO coating (see Figure 6b). That is probably due to the size‐dependent UV absorption 50 where the large particles of GO reduced the absorption of UV rays, and thus, the value of the reflection increases 42,47,51 . Besides, the GO‐coated glazing samples' electrical static bonds were decreased compared with the uncoated samples (see Figure 7).…”

Section: Resultsmentioning

confidence: 99%

Testing new graphene oxide‐coated glazing for papyrus manuscripts in museums: Part I

Deraz

El-Bab

Abdelmoneim

et al. 2021

Surface & Interface Analysis

View full text Add to dashboard Cite

The display of papyrus and paper (as cellulosic materials) in the Egyptian museums is always critical due to the traditional placement of display of sensitive materials between two plates of glass, acrylic, or other types of glazing materials. The sensitivity of the glazing materials to abrasion, ultraviolet rays, dust adhesion, and high light reflectivity are considered concerning issues to conservators, curators, and visitors. In this paper, thin protective coatings of graphene oxide (GO) were synthesized by modified Hummers' method and deposited on selected museums' glazing materials (glass and acrylic) using spin coating. Multi‐analytical techniques were employed to assess the applicability of GO‐coated glazing including scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), Raman spectroscopy (RS), Fourier transform infrared spectroscopy (FTIR), microhardness testing, NIR VIS, and UV spectrophotometer and static potential measurements. The results showed that the glass glazing hardness was increased by ~10% due to the deposition of the GO coating. Moreover, according to glazing type, the reflectance values of the GO‐coated glazing samples, compared with the uncoated samples, confirmed that the thin film of GO improved the UV rays blocking. As is evident in the GO‐coated glass where approximately 27% of UV rays have been blocked, likewise, 19% of UV rays were blocked in GO‐coated acrylic (TRU VUE). Considering VIS and NIR reflection spectra of GO‐coated plexiglass, a higher reflectance is presented by 29%. Furthermore, the static potential measurements showed an energy decline in GO‐coated glazing compared with the uncoated samples.

show abstract

The UV absorption of graphene oxide is size-dependent: possible calibration pitfalls

Cited by 59 publications

References 29 publications

Antibacterial activity of graphene oxide nanosheet against multidrug resistant superbugs isolated from infected patients

Antibacterial activity of graphene oxide nanosheet against multidrug resistant superbugs isolated from infected patients

Green Carbon Nanostructures for Functional Composite Materials

Testing new graphene oxide‐coated glazing for papyrus manuscripts in museums: Part I

Contact Info

Product

Resources

About