Binding efficiency of functional groups towards noble metal surfaces using graphene oxide – metal nanoparticle hybrids

Abbasi, Zeeshan; Saeed, Wajeeha; Shah, Syed Marifat; Shahzad, Sohail Anjum; Bilal, Muhammad; Khan, Abdul Faheem; Shaikh, Ahson Jabbar

doi:10.1016/j.colsurfa.2020.125858

Cited by 26 publications

(3 citation statements)

References 32 publications

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“…Abbasi and co-workers [ 26 ] synthesized Pd nanoparticles using PdCl 2 and NaBH 4 as a strong reducing agent and polyvinyl alcohol (PVA) as stabilizing agent. During the chemical process, the palladium Pd 2+ from the salt solution was reduced to Pd° as nanoparticles.…”

Section: Methods Of Synthesis Nps@go Nanocompositesmentioning

confidence: 99%

Noble Metals Functionalized on Graphene Oxide Obtained by Different Methods—New Catalytic Materials

et al. 2023

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In recent years, research has focused on developing materials exhibiting outstanding mechanical, electrical, thermal, catalytic, magnetic and optical properties such as graphene/polymer, graphene/metal nanoparticles and graphene/ceramic nanocomposites. Two-dimensional sp2 hybridized graphene has become a material of choice in research due to the excellent properties it displays electrically, thermally, optically and mechanically. Noble nanomaterials also present special physical and chemical properties and, therefore, they provide model building blocks in modifying nanoscale structures for various applications, ranging from nanomedicine to catalysis and optics. The introduction of noble metal nanoparticles (NPs) (Au, Ag and Pd) into chemically derived graphene is important in opening new avenues for both materials in different fields where they can provide hybrid materials with exceptional performance due to the synergistical result of the specific properties of each of the materials. This review presents the different synthetic procedures for preparing Pt, Ag, Pd and Au NP/graphene oxide (GO) and reduced graphene oxide (rGO) composites.

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Section: Methods Of Synthesis Nps@go Nanocompositesmentioning

confidence: 99%

Noble Metals Functionalized on Graphene Oxide Obtained by Different Methods—New Catalytic Materials

et al. 2023

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“…It was noted that extinction in the 600−800 nm window was almost unchanged when pH of the reaction solution with R Au/APTES of 1:8 was lowered from 9.0 to 4.1, and that increased to some extent when pH of the reaction solution with R Au/APTES of 1:2 was elevated from 4.1 to 9.0 (Figure 6a,c), indicating the slightly promoted anisotropic character of the resulting Au particles, possibly due to the reduced activity of the gold precursor at elevated pH. 35,36 These results implied that the ratio of R Au/APTES is more effective than pH in tuning shape of the resulting Au particles since the change in pH was not enough to induce the change in the shape of the resulting Au particles at either a low (1:2) or high (1:8) R Au/APTES ratio.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Au Nanoflowers for Catalyzing and In Situ Surface-Enhanced Raman Spectroscopy Monitoring of the Dimerization of p-Aminothiophenol

Han

Zhang

et al. 2021

ACS Omega

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In this work, we demonstrated a facile approach for fabrication of Au nanoflowers (Au NFs) using an amino-containing organosilane, 3-aminopropyltriethoxysilane (APTES), as a shape-directing agent. In this approach, the morphology of the Au particles evolved from sphere-like to flower-like with increasing the concentration of APTES, accompanied by a red shift in the localized surface plasmon resonance peak from 520 to 685 nm. It was identified that the addition of APTES is profitable to direct the preferential growth of the (111) plane of face-centered cubic gold and promote the formation of anisotropic Au NFs. The as-prepared Au NFs, with APTES on their surface, presented effective catalytic and surface-enhanced Raman scattering (SERS) performances, as evidenced by their applications in catalyzing the dimerization of p-aminothiophenol and monitoring the reaction process via in situ SERS analysis.

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“…[31] In our case, while plotting the concentration of GQD against F 0 /F and τ 0 /τ a nonlinearity is observed for both GQD-TPP and GQD-TNaP nanohybrids and that is a portrayal of combined static and dynamic quenching. [32,33] From the earlier reports it is concluded that there is a nonradiative electron transition that occurs from excited porphyrins to GQDs, which competes with the fluorescence of PPys. [34] This non-radiative rate constant, k nr is the comparison between the lifetime values of TPP and TNaP in the absence of GQD (τ o ) and presence of GQD (τ) as in equation 7.…”

Section: Lifetime Analysismentioning

confidence: 99%

An Investigation on the Effect of Extended Conjugation on the Photophysical Properties of Graphene Quantum Dot‐Porphyrin Dyads

2021

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Noncovalent dyads embodied with porphyrin (PPy) and graphene quantum dots (GQDs) were subjected to photophysical studies with the aim of a deep understanding on the electron transfer dynamics in such systems. Peculiarities of a single fluorophore seems to be inadequate in light harvesting materials for various applications which can be rectified by the method of co‐sensitization. In this work Tetraphenylporphyrin (TPP) and Tetranaphthylporphyrin (TNaP) have been utilized for the preparation of the nanohybrid systems to realize the effect of conjugation on the photophysical properties of these materials. The photophysical studies of these nanohybrids such as UV‐Visible spectra, Fluorescence emission spectra and Time‐correlated single photon counting (TCSPC) were carried out. Both the ground and excited state interaction studies indicate an effective association between the two components in these nanohybrids. The photoexcited porphyrin molecules behave as electron donors and GQDs as acceptors and the interaction studies show that the quenching of the porphyrin derivatives occurs through a combined static and dynamic quenching mechanism in the PPy‐GQD nanocomposites. Moreover the extended conjugation in naphthyl system exalted the binding with quantum dots through π‐π interaction and results in augmented electron transfer than that in phenyl nanocomposite. The higher non‐radiative rate constant from TCSPC authenticates the above results. Understanding the photodynamics of electrons in such systems is significant for their effective utilization and practical applications of these materials in light harvesting devices and photocatalysis.

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Binding efficiency of functional groups towards noble metal surfaces using graphene oxide – metal nanoparticle hybrids

Cited by 26 publications

References 32 publications

Noble Metals Functionalized on Graphene Oxide Obtained by Different Methods—New Catalytic Materials

Noble Metals Functionalized on Graphene Oxide Obtained by Different Methods—New Catalytic Materials

Au Nanoflowers for Catalyzing and In Situ Surface-Enhanced Raman Spectroscopy Monitoring of the Dimerization of p-Aminothiophenol

An Investigation on the Effect of Extended Conjugation on the Photophysical Properties of Graphene Quantum Dot‐Porphyrin Dyads

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