Synthesis and characterization of gold graphene composite with dyes as model substrates for decolorization: A surfactant free laser ablation approach

Siddhardha, R.S. Sai; Kumar, Vishal; Kaniyoor, Adarsh; Muthukumar, V. Sai; Ramaprabhu, Sundara; Podila, Ramakrishna; Rao, Apparao M.; Ramamurthy, Sai Sathish

doi:10.1016/j.saa.2014.05.069

Cited by 29 publications

(25 citation statements)

References 32 publications

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“…[ 84,85 ] In such a way, the NPs are directly anchored on the rGO fi lm, creating a microlandscape, as presented in Figure 14 . [ 84 ] In addition, by varying the intensity of the laser beam, the shape, size, and distribution of NPs can be controlled: a higher intensity leads to larger NPs at a lower concentration.…”

Section: Laser-induced Decoration Of Graphene With Inorganic Elementsmentioning

confidence: 99%

“…The Raman spectra confi rmed changes after the composite formation: the peak intensities at 1580 and 2680 cm −1 decreased signifi cantly after AuNP decoration. Siddhardha and colleagues [ 85 ] used fi xed laser parameters in their studies: a nanosecond laser of 1064 nm with a pulse energy of 50 mJ and repetition rate of 10 Hz. However, if the authors varied the parameters, different properties and a different composite structure might be obtained.…”

Section: Laser-induced Decoration Of Graphene With Inorganic Elementsmentioning

confidence: 99%

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Recent Advances in Laser Utilization in the Chemical Modification of Graphene Oxide and Its Applications

Trusovas

Račiukaitis

Niaura

et al. 2015

Advanced Optical Materials

161

110

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the manipulation of graphene and its derivatives occupy a relatively insignifi cant part, i.e., less than 1%. The fi rst publications on graphene modifi cation with laser irradiation appeared in 2008, however, since 2010, the number of publications has risen exponentially.Graphene oxide (GO) has emerged as a versatile material for nanocarbon research. Several types of oxygen-containing functional groups present on the basal plane, and the sheet edge allows GO to interact with a broad range of organic and inorganic materials. [ 9 ] Furthermore, GO is an abundant and low-cost material synthesized from graphite or graphite oxide; it retains a layered structure but, at the same time, it can be characterized by the loss of electronic conjugation caused by the oxy groups at the edge or plane defects. GO has a potential use in energy, [ 10 ] electronics, [ 11 ] molecular sensing areas, [ 12 ] catalysis, [ 13 ] etc. Moreover, it can be reduced chemically or thermally in order to achieve graphenelike properties. [ 14 ] The material produced during such a procedure is usually referred to as "reduced GO" (rGO). However, residual defects such as remnant oxygen atoms, [ 15 ] Stone-Wales defects (pentagon-heptagon pairs), [ 16 ] and holes [ 17 ] appearing due to the loss of carbon (in the form of CO or CO 2 ) from the basal plane [ 18 ] limit the electronic quality of rGO.A laser is a powerful tool which is used for various applications in industry, medicine, science, and material processing. [ 19 ] It is usually employed in different processes such as ablation, etching, cutting of various materials, as well as direct A dramatic rise in research interest in laser-induced graphene oxide (GO) reduction and modifi cation requires an overview of the most recent works on this subject. Typical methods for the recognition and confi rmation of modifi ed graphene and its derivatives, such as Raman, Fourier-transform infra-red (FTIR), X-ray photoelectron (XP), and ultraviolet-visible (UV-vis) spectroscopies, are introduced briefl y in this review. A major part of the survey is devoted to the main modifi cation ways and the laser parameters used in the literature. A discussion of possible reduction and modifi cation mechanisms is also presented. Recent applications, especially in the biomedical fi eld such as cell therapy treatment, as well as signifi cant results of GO modifi cation, are discussed in detail. Finally, perspectives for the application of laser-induced GO modifi cations in passive THz photonics and biomedicine are briefl y addressed.

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Section: Laser-induced Decoration Of Graphene With Inorganic Elementsmentioning

confidence: 99%

Section: Laser-induced Decoration Of Graphene With Inorganic Elementsmentioning

confidence: 99%

Recent Advances in Laser Utilization in the Chemical Modification of Graphene Oxide and Its Applications

Trusovas

Račiukaitis

Niaura

et al. 2015

Advanced Optical Materials

161

110

View full text Add to dashboard Cite

show abstract

“…The obtained nanoparticles were also used as a catalyst for the reduction of two different organic dye molecules Rhodamine B (RhB) and Sulforhodamine 101 hydrate (SRh) by following method reported by Siddhardha et al [52]. An aqueous stock solution of RhB or SRh (2.5 ml of 10 -5 M) was added to ice cold solution of sodium borohydride (0.5 ml of 0.1 M) and to this, nanoparticles dispersions of different volumes (50, 25 and 10 ll) were added as catalyst.…”

Section: Evaluation Of the Catalytic Effect Of Synthesized Gold Nanopmentioning

confidence: 99%

Green synthesis of gold nanoparticles using marine algae and evaluation of their catalytic activity

et al. 2015

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The hazardous effects of current nanoparticle synthesis methods have steered researchers to focus on developing newer eco-friendly methods for synthesizing nanoparticles using non-toxic chemicals. Owing to the diverse applications of nanoparticles in various fields such as catalysis, medicine, diagnostics, and sensors, several novel green approaches have been explored for synthesizing nanoparticles using different natural sources such as plants, algae, bacteria, and fungi. Hence, in the present work, a green method for the synthesis of gold nanoparticles (AuNPs) under ambient conditions using aqueous extracts of marine brown algae is reported and the synthesized AuNPs were evaluated for their catalytic efficiency. The aqueous extracts of algae comprise reducing as well as capping agents required for the formation of AuNPs. The Fourier transform infrared spectra of the extracts revealed the presence of compounds having hydroxyl groups that are largely responsible for the reduction of auric chloride to AuNPs at room temperature. Results from high-resolution transmission electron microscopy and dynamic light scattering studies suggested that most of the biosynthesized AuNPs are nearly spherical in shape with an average size in the range of 27-35 nm. High negative values of zeta potential measurement confirmed the stability of AuNPs. Moreover, the reduction kinetics of AuNPs studied by UV-visible spectrophotometry showed that they have good catalytic efficiency in the degradation of dyes as well as reduction of nitro compounds in the presence of sodium borohydride as reducing agent. This simple process for the biosynthesis of gold nanoparticles is rapid, cost-effective and eco-friendly. The formation of AuNPs was observed with the change of pale yellow gold solution to ruby red color of gold nanoparticles and confirmed by surface plasmon spectra using UV-visible spectroscopy. Nanoparticles synthesized through such environmentally benign routes can be used for synthesizing many other metal nanoparticles as well as for a wide range of biomedical applications, for commercial production on a large scale and also can be used as efficient catalysts for different organic reactions.

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“…GO–PDA–Au′ sheets showed the same trend (from 9.81 to 9.29°) after scrolling. Furthermore, the strong diffraction peaks at 2θ=38.16, 44.38, 64.78, and 77.76° observed on both the GO–PDA–Au sheets and GO–PDA–Au nanoscrolls were attributed to the characteristic (111), (200), (220), and (311) crystalline planes of Au NPs, respectively, indicating that Au NPs were successfully deposited on the GO–PDA sheets . According to the well‐known Scherrer equation, the mean particle size can be calculated to about 14 and 12 nm.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Nanoscrolls by Rolling up Graphene Oxide–Polydopamine–Au Sheets using Lyophilization Method

Yang

Zhang

Wang

et al. 2016

Chemistry An Asian Journal

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Graphene oxide-polydopamine-Au (GO-PDA-Au) nanoscrolls were prepared by rolling up GO-PDA-Au sheets through a simple lyophilization method. The structure of GO-PDA-Au nanoscrolls and GO-PDA-Au sheets were compared by powder X-ray diffraction, Raman spectra, transmission electron microscopy, and scanning electron microscopy. The results demonstrated that the heterogeneous GO-PDA-Au nanoscrolls were synthesized successfully. Polydopamine (PDA) attached at the surface of GO sheets served as binding reagents to anchor and disperse Au nanoparticles (NPs). The electrocatalytic activity of methanol with GO-PDA-Au nanoscrolls and GO-PDA-Au sheets as electrodes were conducted. Compared to GO-PDA-Au sheets, GO-PDA-Au nanoscrolls showed better electrocatalytic activity and electrochemical stability owing to their scrolled structure. This article provides a simple and effective method to prepare GO nanoscrolls containing metal NPs that broadens the applications of the graphene-based materials in optical, magnetic, and catalytic fields.

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Synthesis and characterization of gold graphene composite with dyes as model substrates for decolorization: A surfactant free laser ablation approach

Cited by 29 publications

References 32 publications

Recent Advances in Laser Utilization in the Chemical Modification of Graphene Oxide and Its Applications

Recent Advances in Laser Utilization in the Chemical Modification of Graphene Oxide and Its Applications

Green synthesis of gold nanoparticles using marine algae and evaluation of their catalytic activity

Preparation of Nanoscrolls by Rolling up Graphene Oxide–Polydopamine–Au Sheets using Lyophilization Method

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