Carbon dots (CDots) are a promising biocompatible nanoscale source of light, yet the origin their emission remains under debate. Here, we show that all distinctive optical properties CDots, including giant Stokes shift photoluminescence and strong dependence color on excitation wavelength, can be explained by linear response partially sp2-hybridized carbon domains located surface CDots' sp3-hybridized amorphous cores. Using simple quantum chemical approach, domain hybridization factor...

The influence of chlorine-containing solvents on the optical properties carbon dots supports existence polycyclic aromatic hydrocarbons.

Carbon dots (CDs) with an emission in the near infrared spectral region are attractive due to their promising applications bio-related areas, while fabrication still remains a challenging task. Herein, we developed template-assisted method using porous silica microspheres for formation of CDs optical transitions infrared. Two organic dyes, Rhodamine 6G and IR1061 yellow regions, respectively, were used as precursors CDs. Correlation morphology chemical composition properties obtained...

The efficient scale-up of CO2-reduction technologies is a pivotal step to facilitate intermittent energy storage and for closing the carbon cycle. However, there need minimize occurrence undesirable side reactions like H2 evolution achieve selective production value-added products (CO HCOO–) at as-high-as-possible current densities. Employing novel electrocatalysts such as unsupported metal aerogels, which possess highly porous three-dimensional nanostructure, offers plausible approach...

Metal aerogels have established themselves as promising materials for various applications across diverse fields, from sensing to soft neural implants. Since they emerged a distinct class of in 2009, catalysis has been one their most common application areas. However, even after decade research on metal catalytic purposes, there remains room improvement. The rising costs associated with production, driven by expensive drying techniques and costly precursors, motivated the scientific...

Polymer electrolyte fuel cells (PEFCs) are expected to play a pivotal role in heavy-duty transportation, but careful benchmarking of the kinetics O2-reduction reaction (ORR) and mass transport properties dictating their performance is needed render them market-competitive. This assessment generally relies on extrapolation kinetic behavior observed at low current densities high currents which limitations become significant. However, this regime assumed obey simple Tafel law that does not...

The morphology of chemically synthesized carbon dots can be tuned from amorphous to onion-like particles <italic>via</italic> solvent polarity whereas the thermal treatment conditions influence degree nitrogen doping and their optical properties.

High activity and durability are two key requirements for the successful development of Pt-based ORR catalyst layers polymer electrolyte fuel cell (PEFC) cathodes. Unsupported Pt–Ni aerogels consisting an interconnected nanoparticle network have been shown to fulfill these requirements, but in our previous work, their processing into high-performing (CLs) required inclusion a pore inducer preparation catalyst-coated membranes (CCMs) through hand spraying. Since results latter approach highly...

Luminescent composites based on entirely non-toxic, environmentally friendly compounds are in high demand for a variety of applications photonics and optoelectronics. Carbon dots recently developed kind luminescent nanomaterial that is eco-friendly, biocompatible, easy-to-obtain, inexpensive, with stable widely tunable emission. Herein, we introduce carbon different chemical compositions functional groups at the surface which were embedded nanoporous silicate glass. The structure optical...

Continuous advancements in science and technology the field of flexible devices encourage researchers to dedicate themselves seeking candidates for new transparent conductive films (FTCFs). Our recently developed two-dimensional (2D) metal aerogels are considered as a class FTCFs. Here, we describe large-scale self-assembly synthesis bimetallic Pt–Ni 2D with controllable morphology during synthesis. The obtained require only low quantity precursors percolating nanoscale networks areas up 6...

Heavy metal ions are not subject to biodegradation and could cause the environmental pollution of natural resources water. Many heavy metals highly toxic dangerous human health, even at a minimum amount. This work considered an optical method for detecting using colloidal luminescent semiconductor quantum dots (QDs). Over past decade, QDs have been used in development sensitive fluorescence sensors metal. In this work, we combined fluorescent properties AgInS2/ZnS ternary magnetism...

Two-dimensional random metal networks possess unique electrical and optical properties, such as almost total transparency low sheet resistance, which are closely related to their disordered structure. Here we present a detailed experimental theoretical investigation of plasmonic revealing Anderson (disorder-driven) localized surface plasmon resonances very large quality factors spatial localization close the maximum, couple electromagnetic waves. Moreover, they disappear above...

Transition metal phosphide (TMP) nanoparticles (NPs) have emerged as a versatile material for wide array of energy conversion/storage applications due to their robustness and broad range available compositions, stoichiometries, crystalline structures. Combined with size shape control, this opens many possibilities tailor NPs’ electronic, physical, chemical properties. One the main hurdles towards broader implementation TMP NPs consists in challenging synthesis further exacerbated by limited...

Despite its increased relevance for the ongoing energy transition, CO2-reduction reaction (CO2RR) continues to be poorly understood, particularly in context of how kinetics and product outcome are affected by surface-specific parameters such as interfacial pH. The latter has received attention lately, with numerous studies reporting impact on distribution CO2-electroreduction but failing quantify it reliably due defined mass transport properties electrochemical cells which most those were...

Unsupported, Pt-based electrocatalysts hold great potential for implementation in polymer electrolyte membrane fuel cell (PEMFC-) cathodes owing to their enhanced durability under startup/shutdown conditions entailing high excursions. Among such materials, the recently developed Pt-Ni aerogel consisting of tridimensional nanochains interconnected nanoparticles has already been shown feature an initial PEMFC–performance comparable that C-supported Pt-nanoparticles (Pt/C) along with a much...

The plasmon enhancement of carbon dots (CDs) photoluminescence (PL) in thin-film structures with metal nanoparticles is interest their practical applications sensors and light-emitters. This paper investigates CDs the nanogranulated silver films different thickness. an aqueous solution were precipitated by spin-coating over surface annealed Ag coated previously a polymer layer. IR, optical density PL spectra free-CDs studied. intensity was demonstrated due to absorption cross-section action...

Transition metal phosphide (TMP) nanoparticles (NPs) have emerged as a versatile material for wide array of energy conversion/storage applications due to their robustness and broad range available compositions, stoichiometries, crystalline structures. Combined with size shape control, this opens many possibilities tailor NPs’ electronic, physical, chemical properties. One the main hurdles towards broader implementation TMP NPs consists in challenging synthesis further exacerbated by limited...

Transition metal phosphide (TMP) nanoparticles (NPs) have emerged as a versatile material for wide array of energy conversion/storage applications due to their robustness and broad range available compositions, stoichiometries, crystalline structures. Combined with size shape control, this opens many possibilities tailor NPs’ electronic, physical, chemical properties. One the main hurdles towards broader implementation TMP NPs consists in challenging synthesis further exacerbated by limited...

Abstract Transition metal phosphide (TMP) nanoparticles (NPs) are versatile materials for energy conversion/storage applications due to their robustness and many possibilities tailor NPs’ electronic, physical, chemical properties. One of the hurdles toward broader implementation is challenging synthesis exacerbated by limited choice phosphorus precursors. On one hand, TMP NPs can employ various alkyl‐ or arylphosphines requiring prolonged heating at high temperatures, while on other highly...

The preparation of aerogels in the form thin films deposited on a substrate (e.g., as an electrode material) is attractive but challenging task. Such are expected to combine highly porous gel nanostructure, good mechanical stability, and remarkably high specific surface area with efficient charge-carrier transport via interconnected nanoparticle chains. All together, they make them for fabrication (electro)catalysts or sensors microfluidics, flexible electrodes microelectronics, soft...

Abstract Carbon dots have attracted much attention due to the ease of synthetic methods and their stable photoluminescence with relatively high quantum yield. By doping carbon dot by heteroatoms optical transitions can be tuned in a wide spectral range. In this work, impact on properties has been investigated: appearance luminescent states attributed CD surface dependence lifetime versus emission wavelength revealed.

Due to their excellent optical properties, luminescent carbon dots can find application in various fields, including biomedicine, sensing, and optoelectronics, particular for the development of advanced white light- emitting diodes (LEDs). Herein, we developed a microwave-assisted colloidal synthesis five types starting from o-phenylenediamine as precursor. The emission fabricated be tuned over wide spectral range (430-590 nm) by using nitrogen-containing solvents or additional precursors...