Sustainable energy conversion & storage systems

Noncovalently Linked Metallacarboranes on Functionalized Magnetic Nanoparticles as Highly Efficient, Robust, and Reusable Photocatalysts in Aqueous Medium

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Autores: Isabel Guerrero, Arpita Saha, Jewel Ann Maria XavierJewel Ann Maria Xavier, Clara Viñas, Isabel Romero*, and Francesc Teixidor*
Citation:
ACS Appl. Mater. Interfaces 2020, 12, 50, 56372–56384
Publication Date:December 7, 2020
DOI: https://doi.org/10.1021/acsami.0c17847
PlumX: Noncovalently Linked Metallacarboranes on Functionalized Magnetic Nanoparticles as Highly Efficient, Robust, and Reusable Photocatalysts in Aqueous Medium
A successful homogeneous photoredox catalyst has been fruitfully heterogenized on magnetic nanoparticles (MNPs) coated with a silica layer, keeping intact its homogeneous catalytic properties but gaining others due to the easy magnetic separation and recyclability. The amine-terminated magnetic silica nanoparticles linked noncovalently to H[3,3′-Co(1,2-C2B9H11)2]− (H[1]), termed MSNPs-NH2@H[1], are highly stable and do not produce any leakage of the photoredox catalyst H[1] in water. The magnetite MNPs were coated with SiO2 to provide colloidal stability and silanol groups to be tethered to amine-containing units.

Energy

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Large-Scale Soft-Lithographic Patterning of Plasmonic Nanoparticles

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Autores: Naihao Chiang*, Leonardo Scarabelli*, Gail A. Vinnacombe-Willson, Luis A. Pérez, Camilla Dore, Agustín Mihi, Steven J. Jonas*, and Paul S. Weiss*
Citation:
ACS Materials Lett. 2021, 3, XXX, 282–289
Publication Date:February 12, 2021
DOI: https://doi.org/10.1021/acsmaterialslett.0c00535
PlumX: Large-Scale Soft-Lithographic Patterning of Plasmonic Nanoparticles
Micro- and nanoscale patterned monolayers of plasmonic nanoparticles were fabricated by combining concepts from colloidal chemistry, self-assembly, and subtractive soft lithography. Leveraging chemical interactions between the capping ligands of pre-synthesized gold colloids and a polydimethylsiloxane stamp, we demonstrated patterning gold nanoparticles over centimeter-scale areas with a variety of micro- and nanoscale geometries, including islands, lines, and chiral structures (e.g., square spirals).

Energy

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Disentangling Electron–Phonon Coupling and Thermal Expansion Effects in the Band Gap Renormalization of Perovskite Nanocrystals

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Autores: Andrea Rubino, Adrián Francisco-López, Alex J. Barker, Annamaria Petrozza, Mauricio E. Calvo, Alejandro R. Goñi*, and Hernán Míguez*
Citation:
J. Phys. Chem. Lett. 2021, 12, 1, 569–575
Publication Date:December 31, 2020
https://doi.org/10.1021/acs.jpclett.0c03042
PlumX: Disentangling Electron–Phonon Coupling and Thermal Expansion Effects in the Band Gap Renormalization of Perovskite Nanocrystals
The complex electron–phonon interaction occurring in bulk lead halide perovskites gives rise to anomalous temperature dependences, like the widening of the electronic band gap as temperature increases. However, possible confinement effects on the electron–phonon coupling in the nanocrystalline version of these materials remain unexplored. Herein, we study the temperature (ranging from 80 K to ambient) and hydrostatic pressure (from atmospheric to 0.6 GPa) dependence of the photoluminescence of ligand-free methylammonium lead triiodide nanocrystals with controlled sizes embedded in a porous silica matrix.

Energy

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Laser fabrication of hybrid electrodes composed of nanocarbons mixed with cerium and manganese oxides for supercapacitive energy storage

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Autores: Pablo García Lebière, * Ángel Pérez del Pino, Guillem Domènech Domingo, Constantin Logofatu, Immaculada Martínez-Rovira, Ibraheem Yousef and Enikö György
Citation: J. Mater. Chem. A, 2021, Advance Article
https://doi.org/10.1039/D0TA06756C
PlumX: Laser fabrication of hybrid electrodes composed of nanocarbons mixed with cerium and manganese oxides for supercapacitive energy storage
Novel composite materials are being investigated for improving the energy storage performance of electrochemical capacitors. For this goal, synergistic effects via the combination of diverse types of materials are crucial. In this work, electrodes composed of reduced graphene oxide, multiwall carbon nanotubes, as well as cerium and manganese oxides were fabricated through reactive inverse matrix-assisted pulsed laser evaporation (RIMAPLE).

Energy

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Predicting the photocurrent–composition dependence in organic solar cells

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Autores: Xabier Rodríguez-Martínez, Enrique Pascual-San-José, Zhuping Fei, Martin Heeney, Roger Guimerà and  Mariano Campoy-Quiles
Citation: Energy Environ. Sci., 2021, Advance Article
https://doi.org/10.1039/D0EE02958K
PlumX: Predicting the photocurrent–composition dependence in organic solar cells

The continuous development of improved non-fullerene acceptors and deeper knowledge of the fundamental mechanisms governing performance underpin the vertiginous increase in efficiency witnessed by organic photovoltaics. While the influence of parameters like film thickness and morphology are generally understood, what determines the strong dependence of the photocurrent on the donor and acceptor fractions remains elusive.

Energy

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Enhanced Directional Light Extraction from Patterned Rare‐Earth Phosphor Films

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Autores: Elena Cabello‐Olmo, Pau Molet, Agustín Mihi, Gabriel Lozano, Hernán Míguez
Citation: Adv. Optical Mater. 2020, 2001611.
DOI: https://doi.org/10.1002/adom.202001611
PlumX: Enhanced Directional Light Extraction from Patterned Rare‐Earth Phosphor Films

The combination of light‐emitting diodes (LEDs) and rare earth (RE) phosphors as color‐converting layers comprises the basis of solid‐state lighting. Indeed, most LED lamps include a photoluminescent coating made of phosphor material, i.e., crystalline matrix suitably doped with RE elements, to produce white light from a blue or ultraviolet LED chip.

Energy

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Quasiballistic phonon transport from first principles

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Autores: Pol Torres, Miquel Royo, Miquel López-Suárez, Junichiro Shiomi, and Riccardo Rurali
Citation: Phys. Rev. B 102, 144305 – Published 26 October 2020
DOI: https://doi.org/10.1103/PhysRevB.102.144305
PlumX: Quasiballistic phonon transport from first principles
At short length scales phonon transport is ballistic: the thermal resistance of semiconductors and insulators is quantized and length independent. At long length scales, on the other hand, transport is diffusive and resistance arises as a result of the scattering processes experienced by phonons. In many cases of interest, however, these two transport regimes coexist. Here we propose a first-principles approach to treat quasiballistic phonon transport where diffusive and ballistic phonons receive separate theoretical treatments.

Energy

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Beating the Thermal Conductivity Alloy Limit Using Long-Period Compositionally Graded Si1–xGex Superlattices

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Título : Beating the Thermal Conductivity Alloy Limit Using Long-Period Compositionally Graded Si1–xGex Superlattices
Autores: P. Ferrando-Villalba, Shunda Chen, A. F. Lopeandía, F. X. Alvarez, M. I. Alonso, M. Garriga, J. Santiso, G. Garcia, A. R. Goñi, D. Donadio*, and J. Rodríguez-Viejo*
Citation:
J. Phys. Chem. C 2020, 124, 36, 19864–19872
Publication Date:August 11, 2020
https://doi.org/10.1021/acs.jpcc.0c06410
PlumX: Beating the Thermal Conductivity Alloy Limit Using Long-Period Compositionally Graded Si1–xGex Superlattices
Superlattices with scattering mechanisms at multiple length scales efficiently scatter phonons at all relevant wavelengths and provide a convenient route to reduce thermal transport. Here, we show, both experimentally and by atomistic simulations, that SiGe superlattices with well-established compositional gradients and a sufficient number of interfaces exhibit extremely low thermal conductivity. 

Energy

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Homoconjugation in Light-Emitting Poly(phenylene methylene)s: Origin and Pressure-Enhanced Photoluminescence

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Autores: Aleksandr Perevedentsev*, Adrián Francisco-López, Xingyuan Shi, Andreas Braendle, Walter R. Caseri, Alejandro R. Goñi, and Mariano Campoy-Quiles
Citation:
Macromolecules 2020, 53, 17, 7519–7527
Publication Date: August 26, 2020 
DOI: https://doi.org/10.1021/acs.macromol.0c01153
PlumX: Homoconjugation in Light-Emitting Poly(phenylene methylene)s: Origin and Pressure-Enhanced Photoluminescence
The surprising optical properties of the non-π-conjugated polymer poly(phenylene methylene) (PPM) and its derivatives—that is, absorption in the 350–450 nm and photoluminescence (PL) in the 400–600 nm spectral regions—have been attributed to chromophores formed by homoconjugation along the polymer chain. The enabling role of homoconjugation, however, was hitherto ascertained primarily by excluding alternative origins of luminescence.

Energy

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Hydroxypropyl Cellulose Adhesives for Transfer Printing of Carbon Nanotubes and Metallic Nanostructures

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Autores: Camilla Dore, Bernhard Dörling, Juan Luis Garcia‐Pomar, Mariano Campoy‐Quiles, Agustín Mihi
Citation: Small 2020, 2004795
DOI:https://doi.org/10.1002/smll.202004795
 
PlumX: Hydroxypropyl Cellulose Adhesives for Transfer Printing of Carbon Nanotubes and Metallic Nanostructures
Transfer printing is one of the key nanofabrication techniques for the large‐scale manufacturing of complex device architectures. It provides a cost‐effective and high‐throughput route for the integration of independently processed materials into spatially tailored architectures.

Energy

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High‐Throughput Nanofabrication of Metasurfaces with Polarization‐Dependent Response

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Metal nanostructures offer exciting ways to manage light at the nanoscale exploited in fields such as imaging, sensing, energy conversion, and information processing. The optical response of the metallic architectures can be engineered to exhibit photonic properties that span from plasmon resonances to more complex phenomena such as negative refractive index, optical chirality, artificial magnetism, and more.

Energy

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Electrodeposited Negative Index Metamaterials with Visible and Near Infrared Response

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Negative index metamaterials have revolutionized the field of photonics because of their unconventional electromagnetic properties absent in naturally occurring materials. It remains a challenge however, to achieve strong negative refractive index at optical frequencies over large areas in a device compatible fashion.

Energy

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Towards photovoltaic windows: scalable fabrication of semitransparent modules based on non-fullerene acceptors via laser-patterning

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Semitransparent organic photovoltaics (OPV) possess unique properties that make them highly appealing for their integration into semitransparent architectonic elements such as windows or glazings. In order to provide sufficient transparency, non-opaque electrodes and thin photoactive layers are typically used, thus limiting the light-harvesting capacity.

Energy

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Photoflexoelectric effect in halide perovskites

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Harvesting environmental energy to generate electricity is a key scientific and technological endeavour of our time. Photovoltaic conversion and electromechanical transduction are two common energy-harvesting mechanisms based on, respectively, semiconducting junctions and piezoelectric insulators.

Energy

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Large area metasurfaces made with spherical silicon resonators

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Pau Molet, Luz Karimé Gil-Herrera, Juan Luis Garcia-Pomar, Niccolò Caselli, Álvaro Blanco, Cefe López, Agustín Mihi. Nanophotonics. Received January 16, 2020; revised February 20, 2020; accepted February 22, 2020.

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Narrow linewidth quantum emitters in electron-beam shaped polymer

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Carlotta Ciancico, Kevin Schädler, Sofia Pazzagli, Maja Colautti, Pietro Lombardi, Johann Osmond, Camilla Dore, Agustin Mihi, Anna Ovvyan, Wolfram HP Pernice, Enrico Berretti, Alessandro Lavacchi, Costanza Toninelli, Frank H.L. Koppens, Antoine Reserbat-Plantey. ACS Photonics

Energy

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Assembly-Induced Bright-Light Emission from Solution-Processed Platinum(II) Inorganic Polymers

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Aleksandr Perevedentsev*, Fabio L. Bargardi*, Antoni Sánchez-Ferrer, Nathan J. Cheetham, Ahmad Sousaraei, Stephan Busato, Johannes Gierschner, Begoña Milián-MedinaBegoña Milián-Medina, Raffaele Mezzenga, Reinhold Wannemacher, Juan Cabanillas-Gonzalez, Mariano Campoy-Quiles and Walter R. Caseri.  ACS Omega20194610192-10204. Publication Date:June 12, 2019

Energy

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