Journal ArticleDOI
Impact of Gold Nanoparticle Stabilizing Ligands on the Colloidal Catalytic Reduction of 4-Nitrophenol
Reads0
Chats0
TLDR
In this paper, the authors investigated thiolated polyethylene glycol (HS-PEG) as a stabilizing ligand during AuNP catalytic reduction of 4-nitrophenol.Abstract:
Gold nanoparticles (AuNPs) have received considerable interest owing to their unique properties and applications in catalysis. One of the major challenges for colloidal nanoparticles in catalysis is the limited stability and resulting aggregation. Nanoparticle functionalization with ligands or polymers is a common strategy to improve the colloidal stability, which in turn blocks the reactive surface sites and eliminates catalytic activity. Here, we investigate thiolated polyethylene glycol (HS-PEG) as a stabilizing ligand during AuNP catalytic reduction of 4-nitrophenol. We show a direct relationship between the chain length and packing density of HS-PEG with respect to AuNP catalytic activity. High surface coverage of low molecular weight HS-PEG (1 kDa) completely inhibited the catalytic activity of AuNPs. Increasing HS-PEG molecular weight and decreasing surface coverage was found to correlate directly with increasing rate constants and decreasing induction time. Time-resolved UV–vis absorbance spectros...read more
Citations
More filters
Journal ArticleDOI
Atomically Precise Clusters of Noble Metals: Emerging Link between Atoms and Nanoparticles
TL;DR: Luminescence in the visible region, especially by clusters protected with proteins, with a large Stokes shift, has been used for various sensing applications, down to a few tens of molecules/ions, in air and water.
Journal ArticleDOI
The Role of Ligands in the Chemical Synthesis and Applications of Inorganic Nanoparticles.
Amelie Heuer-Jungemann,Neus Feliu,Neus Feliu,Ioanna Bakaimi,Majd A. Hamaly,Alaaldin M. Alkilany,Alaaldin M. Alkilany,Indranath Chakraborty,Atif Masood,Maria Francesca Casula,Athanasia Kostopoulou,Eunkeu Oh,Kimihiro Susumu,Michael H. Stewart,Igor L. Medintz,Emmanuel Stratakis,Wolfgang J. Parak,Antonios G. Kanaras +17 more
TL;DR: This article analyzes the interaction of nanoparticle surface and ligands with different chemical groups, the types of bonding, the final dispersibility of ligand-coated nanoparticles in complex media, their reactivity, and their performance in biomedicine, photodetectors, photovoltaic devices, light-emitting devices, sensors, memory devices, thermoelectric applications, and catalysis.
Journal ArticleDOI
Surface modification of nanozymes
Biwu Liu,Juewen Liu +1 more
TL;DR: Nanoparticles and proteins are similar in a number of aspects, and using nanoparticles to mimic the catalytic function of enzymes is an interesting yet challenging task as mentioned in this paper, and many different types of nanozymes have been reported to catalyze a broad range of reactions for chemical, analytical, and biomedical applications.
Journal ArticleDOI
Toward Active-Site Tailoring in Heterogeneous Catalysis by Atomically Precise Metal Nanoclusters with Crystallographic Structures.
TL;DR: This Review summarizes the progress in the utilization of atomically precise metal nanoclusters for catalysis, a new class of model catalysts that have enabled heterogeneous catalysis research at the single-atom and single-electron levels.
Journal ArticleDOI
Recent Advances in the Nanocatalyst-Assisted NaBH4 Reduction of Nitroaromatics in Water
Kaiqiang Zhang,Jun Min Suh,Ji-Won Choi,Ho Won Jang,Mohammadreza Shokouhimehr,Rajender S. Varma +5 more
TL;DR: This article illustrates recent advances on the use of nanocatalysts for an important reduction reaction, the hydrogenation of nitroaromatics to significant aminoaromatic with aqueous NaBH4 solution, and the utility of mono- and multimetal nanoc atalysts with special emphasis on heterogeneous nanocats.
References
More filters
Journal ArticleDOI
Nanoparticle PEGylation for imaging and therapy
TL;DR: A background to investigators new to stealth nanoparticles is presented, and some key considerations needed prior to designing a nanoparticle PEGylation protocol and characterizing the performance features of the product are suggested.
Journal ArticleDOI
Self-assembled monolayers of thiols and dithiols on gold: new challenges for a well-known system
TL;DR: The nature of the molecule-gold interface, whose chemistry and structure remain elusive, the self-assembly process on planar and irregular surfaces, and on nanometre-sized objects, and the chemical reactivity and thermal stability of these systems in ambient and aqueous solutions are reviewed.
Journal ArticleDOI
Kinetic Analysis of Catalytic Reduction of 4-Nitrophenol by Metallic Nanoparticles Immobilized in Spherical Polyelectrolyte Brushes
TL;DR: In this article, a study on the catalytic reduction of 4-nitrophenol by sodium borohydride in the presence of metal nanoparticles is presented, where the nanoparticles are embedded in spherical polyelectrolyte brushes.
Journal ArticleDOI
Catalysis by metallic nanoparticles in aqueous solution: model reactions.
Pablo Hervés,Moisés Pérez-Lorenzo,Luis M. Liz-Marzán,Joachim Dzubiella,Joachim Dzubiella,Yan Lu,Yan Lu,Matthias Ballauff,Matthias Ballauff +8 more
TL;DR: This tutorial review a subset of well-studied reactions that take place in aqueous phase and for which a comprehensive kinetic analysis is available, namely the reduction of p-nitrophenol and hexacyanoferrate, both by borohydride ions.