Abstract The shape sensitivity of Pd catalysts in Suzuki–Miyaura coupling reactions is studied using nanocrystals enclosed by well‐defined surface facets. catalytic performance with cubic, cuboctahedral and octahedral morphologies are compared. Superior reactivity observed for NCs {100} facets compared to {111} origin the enhanced associated a cubic morphology related leaching susceptibility nanocrystals. Molecular oxygen plays key role facilitating atoms from interaction O 2 itself...

Since the isolation of two-dimensional (2D) phosphorene, black phosphorus (BP) has gained popularity due to its high carrier mobility and tunable bandgap. Poor ambient stability BP remains a key issue impedes use in electronic applications. Here we report new stabilization strategy based on covalent functionalization liquid exfoliated few-layer using aryl iodonium salts. Arylation salts enables modification without inducing oxidation alters degradation chemistry by inhibiting bridged oxygen...

This perspective reviews recent advances in inverse opal structures, how they have been developed, studied and applied as catalysts, catalyst support materials, electrode materials for batteries, water splitting applications, solar-to-fuel conversion electrochromics, finally photonic photocatalysts photoelectrocatalysts. Throughout, we detail some of the salient optical characteristics that underpin results form basis light-matter interactions span electrochemical energy systems well...

The structure–property relationship of palladium (Pd) catalysts in Suzuki–Miyaura cross-coupling reactions was investigated using Pd nanocrystals uniform size and shape. Superior catalytic reactivity observed for nanoparticles with high-index {730} surface facets compared to low-index {100} facets. Although the nanocrystal morphologies were maintained during reaction, presence clusters, identified by high-resolution transmission electron microscopy (TEM), indicates a leaching mechanism....

A high surface area 3D ordered SnO2 inverted opal with walls composed of interconnected nanocrystals is reported using a facile approach tin acetate precursors. The hierarchically porous structure exhibits porosity on multiple lengths scales (cm down to nm). thickness the IO wall comprising oxide can be tuned by infilling precursor. Using highly monodisperse Pd nanoparticles, we show how functionalized immobilized NP assemblies. We that size dispersion controlled utilizing weak ligand–metal...

The development of semiconductor nanowires has recently been the focus extensive research as these structures may play an important role in next generation nanoscale devices. Using building blocks, a number high performance electronic devices have fabricated. In this review, we discuss synthetic methodologies and electrical characteristics Si, Ge, Ge/Si core/shell nanowires. particular fabrication properties variety nanowire-based field effect transistors (FETs) are discussed. Although...

The reduced dimensionality of nanowires implies that surface effects significantly influence their properties, which has important implications for the fabrication nanodevices such as field effect transistors and sensors. This review will explore strategies available wet chemical functionalisation silicon (Si) germanium (Ge) nanowires. stability electrical properties modified Si Ge is explored. While this focus primarily on nanowire surfaces, much been learned from work planar substrates...

A critical aspect in the practical applications and catalytic performance of shape-controlled nanocrystals is their stability morphology retention under ambient conditions. Changes to Pd capped by PVP are assessed TEM, surface oxidation was evaluated X-ray photoelectron spectroscopy (XPS) over 12 months. Surface PVP-capped resulted loss edge corner sites a transition spherical morphologies. The shape found follow trend cubic < cuboctahedra octahedral ∼ concave cubes. For low index planes,...

Black phosphorus (BP) is emerging as a promising candidate for electronic, optical, and energy storage applications. However, its poor ambient stability remains critical challenge. Evaluation of few-layer liquid-exfoliated BP during exposure using X-ray photoelectron spectroscopy attenuated total reflectance Fourier transform infrared allows surface chemistry to be investigated. Oxidation initially occurs through nonbridging oxide species, which convert bridging species after exposure. We...

The development of efficient catalysts for the chemical recycling poly(ethylene terephthalate) (PET) is essential to tackling global issue plastic waste. There has been intense interest in heterogeneous as a sustainable catalyst system PET depolymerization, having advantage easy separation and reuse after reaction. In this work, we explore design by comparing metal-ion (Fe3+) metal-oxide nanoparticle (Fe2O3 NP) immobilized on mesoporous silica (SiO2) functionalized with different...

Closed-loop systems enable circular economy and applications in the food beverage sector to enhance decarbonisation. Whiskey distillation by-products are amenable anaerobic digestion thus facilitate resource recovery circularity. Furthermore, biochar derived from whiskey barrels can be used as a carbonaceous additive within biomethane production. In this paper, produced pyrolysis of discarded at 300 °C, was shown production by up 15 %. A kinetic analysis revealed that reduced lag time 42 The...

A study of the synergistic effect Fe and Ce in microwave-assisted heterogeneous Fenton-type oxidation low-density polyethylene to value-added chemicals over a Fe–CeO 2 catalyst.

The use of renewable feedstocks such as biomass aligns with global priorities sustainability and climate change. Integrating these materials into experiments helps students understand the real-world relevance chemistry to addressing environmental challenges. Here, we show that biochar a feedstock provides an inquiry-based laboratory activity gives opportunity engage in authentic investigative process. This describes cocurricular summer workshop carried out undergraduate who had no prior...

The development of size- and shape-controlled nanomaterials is essential to tailor their properties performance for wide-ranging applications from catalysis sensing. Solid-state synthesis nanostructures attractive a sustainability perspective, but they typically lack the desired size shape control at small-scale dimensions. This work shows that colloidal precursors can be used in solid-state route form hybrid core–shell with simultaneous morphology control. Encapsulation PtNPs well-defined...

The use of stabilizers is an essential part colloidal catalyst preparation; however their impact on catalytic behavior challenging to elucidate. This report evaluates three commonly used nanoparticle (NP) stabilizing ligands, oleylamine (OAm), dodecanethiol (DDT), and the polymer polyvinylpyrrolidone (PVP). Stabilizing ligands are removed using thermal chemical pretreatments, surface chemistry NPs assessed X-ray photoelectron spectroscopy (XPS). method ligand removal significantly altered...

Many applications of germanium (Ge) are underpinned by effective oxide removal and surface passivation. This important treatment step often requires H-X (X = Cl, Br, I) or HF etchants. Here, we show that aqueous citric acid solutions in the GeOx. The stability acid-treated Ge(100) is compared to HCl treated surfaces analyzed X-ray photoelectron spectroscopy. Further Ge passivation was investigated thiolation using alkane monothiols dithiols. organic layers good with no regrowth observed...

Recent developments in tailoring the structural and chemical properties of colloidal metal nanoparticles (NPs) have led to significant enhancements catalyst performance. Controllable synthesis has also allowed tailor-made NPs serve as mechanistic probes for catalytic processes. The innovative use gain fundamental insights into function will be highlighted across a variety electrocatalytic applications. engineering future heterogenous catalysts is moving beyond size, shape composition...

Abstract Plasmonic photocatalysis has facilitated rapid progress in enhancing photocatalytic efficiency under visible light irradiation. Poor visible‐light‐responsive materials and low remain major challenges. metal–semiconductor heterostructures where both the metal semiconductor are photosensitive promising for harvesting catalysis, as components can absorb solar light. Efficiency of photon capture be further improved by structuring catalyst a photonic crystal. Here, synthesis crystal...

A range of Pt and Pt–Re catalysts on titania were mechanochemically prepared compared to conventional made by wet impregnation for the selective hydrogenation stearic acid. Mechanochemically showed superior selectivity toward stearyl alcohol catalysts. It was possible achieve 100% using Pt/TiO2.

Chemical recycling is an important strategy to tackle the growing global problem of plastic waste pollution. Covalent attachment oganocatalysts porous SiO 2 creates metal free heterogeneous catalysts for open and closed loop PET PLA.

The ambient stability and surface coverage of halogen (Cl, Br, I) passivated germanium nanowires were investigated by X-ray photoelectron emission spectroscopy. After exposure to air for 24 h, the halogen-terminated Ge nanowire surfaces toward reoxidation was found improve with increasing size atoms, i.e., I > Br Cl. Halogen termination effective in removing native oxide (GeOx) could also be utilized further functionalization. Functionalization halogenated using alkyl Grignard reagents...