Publications de Claudia Esther Avalos

Solid-state 31P NMR reveals the biological organophosphorus compounds as the dominant phosphorus species in Saharan dust aerosols

Athanasios Nenes, Pierre Rossi, Kalliopi Violaki, Christos Panagiotopoulos, Claudia Esther Avalos

Phosphorus is a critical nutrient affecting primary productivity across all ecosystems. Many regions worldwide are limited or co-limited by phosphorus availability, which can be alleviated through atmospheric deposition. Dust is known to be a key external ...

2025

Optically Enhanced Solid-State H-1 NMR Spectroscopy

David Lyndon Emsley, Jean-Philippe Ansermet, Federico De Biasi, Saumya Badoni, Dominik Józef Kubicki, Aaron James Rossini, Jonas Milani, Gabriele Stevanato, Michael Allan Hope, Moreno Lelli

Low sensitivity is the primary limitation to extendingnuclearmagnetic resonance (NMR) techniques to more advanced chemical andstructural studies. Photochemically induced dynamic nuclear polarization(photo-CIDNP) is an NMR hyperpolarization technique where ...

AMER CHEMICAL SOC2023

Fully Conjugated Benzyne-Derived Three-Dimensional Porous Organic Polymers

Claudia Esther Avalos

Porous organic polymers (POPs) have gained tremendous attention owing to their chemical tunability, stability and high surface areas. Whereas there are several examples of fully conjugated two-dimensional (2D) POPs, three-dimensional (3D) ones are rather c ...

2023

Atom-by-Atom Synthesis of Multiatom-Supported Catalytic Clusters by Liquid-Phase Atomic Layer Deposition

Ursula Röthlisberger, Jeremy Luterbacher, Mounir Driss Mensi, Murat Kiliç, Claudia Esther Avalos, Benjamin Pierre Le Monnier

Here, we introduce a method for the synthesis of atomically precise, supported, multiatom catalysts by liquid-phase atomic layer deposition. This technique is based on consecutive grafting reactions in mild conditions that build supported active sites atom ...

2022

Thiocyanate-Mediated Dimensionality Transformation of Low- Dimensional Perovskites for Photovoltaics

Michael Graetzel, Shaik Mohammed Zakeeruddin, Jovana Milic, Ulf Anders Hagfeldt, Yuhang Liu, Dan Ren, Zaiwei Wang, Claudia Esther Avalos, Brian Irving Carlsen

Two-dimensional (2D) hybrid perovskite solar cells have induced widespread research interest owing to their higher stability as compared to three-dimensional (3D) analogues. The photovoltaic performance, however, is still limited. Here, we report a perovsk ...

2022

Hybridization of Synthetic Humins with a Metal-Organic Framework for Precious Metal Recovery and Reuse

Wendy Lee Queen, Jordi Espin Marti, Till Marian Schertenleib, Olga Trukhina, Claudia Esther Avalos, Vikram Vinayak Karve

The number of synthetic strategies used to functionalize MOFs with polymers is rapidly growing; this stems from the knowledge that non-native polymeric guests can significantly boost MOF performance in a number of desirable applications. The current work p ...

AMER CHEMICAL SOC2021

Enhanced Room-Temperature Ionic Conductivity of NaCB11H12 via High-Energy Mechanical Milling

Laura Piveteau, Claudia Esther Avalos, Radovan Cerny, Matteo Brighi

The body-centered cubic (bcc) polymorph of NaCB11H12 has been stabilized at room temperature by highenergy mechanical milling. Temperature-dependent electrochemical impedance spectroscopy shows an optimum at 45-min milling time, leading to an rt conductivi ...

AMER CHEMICAL SOC2021

Methylammonium Triiodide for Defect Engineering of High-Efficiency Perovskite Solar Cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Ursula Röthlisberger, Jacques-Edouard Moser, Mounir Driss Mensi, Pascal Alexander Schouwink, Felix Thomas Eickemeyer, Mathias Dankl, Ulf Anders Hagfeldt, Lukas Pfeifer

The defects present in metal halide perovskite are deleterious to both the performance and stability of photovoltaic devices. Consequently, there is an intense focus on developing defect mitigation strategies. Herein we report a facile strategy that employ ...

2021

Enhanced Intersystem Crossing and Transient Electron Spin Polarization in a Photoexcited Pentacene–Trityl Radical

David Lyndon Emsley, Jacques-Edouard Moser, Aaron James Rossini, Dominik Józef Kubicki, Etienne Christophe Socie, Moreno Lelli, Gabriele Stevanato, Claudia Esther Avalos

Identifying and characterizing systems that generate well-defined states with large electron spin polarization is of high interest for applications in molecular spintronics, high-energy physics, and magnetic resonance spectroscopy. The generation of electr ...

2020

Vapor-assisted deposition of highly efficient, stable black-phase FAPbI(3) perovskite solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, David Lyndon Emsley, Ursula Röthlisberger, Wolfgang Richard Tress, Likai Zheng, Felix Thomas Eickemeyer, Ulf Anders Hagfeldt, Yuhang Liu, Zaiwei Wang

Mixtures of cations or halides with FAPbI(3) (where FA is formamidinium) lead to high efficiency in perovskite solar cells (PSCs) but also to blue-shifted absorption and long-term stability issues caused by loss of volatile methylammonium (MA) and phase se ...

American Association for the Advancement of Science2020