Article
Chemistry, Physical
Valter Kiisk, Michal Novotny, Margus Kodu, Siim Pikker, Tea Avarmaa, Jan Remsa, Jan Lancok, Martin Vrnata, Raivo Jaaniso
Summary: Many research activities focus on functional luminescent materials based on metal oxides and trivalent rare earth ions. Specific applications require optimizing material preparation, annealing, and excitation-detection techniques. In this study, pulsed laser deposition was used to obtain thin TiO2 films containing 1 at% of samarium or neodymium impurity ions. The effects of pulsed laser annealing on their structure and luminescent properties were investigated.
APPLIED SURFACE SCIENCE
(2023)
Article
Multidisciplinary Sciences
L. Hesami, C. Yang, E. Anwar, N. Noginova, M. A. Noginov
Summary: In this study, we investigated the effects of metal-dielectric substrates on the photopolymerization of the BITh monomer. We found that the rate of photopolymerization can be controlled by adjusting the pumping intensity. Compared to previous research, the rate of photopolymerization of BITh increases slightly when a thin insulating MgF2 layer is used to separate the monomer from silver, preventing charge transfer. On the other hand, if the monomer is directly deposited on an Ag film with charge transfer allowed, the rate of photopolymerization increases threefold. Additionally, Au substrates enhance the monomer film absorption and the rate of photopolymerization by approximately 50%.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Giovanni Spinelli, George H. Morritt, Michele Pavone, Michael R. Probert, Paul G. Waddel, Tomas Edvinsson, Ana Belen Munoz-Garcia, Marina Freitag
Summary: Two coordination complexes were synthesized by combining different metal centers with dithiolene complexes [M(mnt)(2)](2-) and a copper(II) coordination complex [Cu(Stetra)]. The Cu-Cu variant exhibited semiconductor behavior with a conductivity of approximately 2.5 x 10(-8) S cm(-1), whereas the Ni-Cu variant showed no observable conductivity. Computational studies revealed that Cu-Cu had lower reorganization energy losses, resulting in a lower barrier to the charge transfer process, which explains its higher conductivity.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Giovanni Spinelli, George H. Morritt, Michele Pavone, Michael R. Probert, Paul G. Waddel, Tomas Edvinsson, Ana Belen Munoz-Garcia, Marina Freitag
Summary: Two coordination complexes were synthesized by combining the dithiolene complexes [M(mnt)2]2- (mnt = maleonitriledithiolate; M = Ni2+ or Cu2+) as anion with the copper(II) coordination complex [Cu(Stetra)] (Stetra = 6,6 '- bis(4,5-dihydrothiazol-2-yl)-2,2 '-bipyri-dine) as cation. The variation of metal centers led to a significant change in conductivity, with the Cu2+ variant (Cu-Cu) displaying semiconductor behavior, while the Ni2+ variant (Ni-Cu) showed no observable conductivity. Computational studies revealed that Cu-Cu exhibited minimized reorganization energy losses and a lower barrier to the charge transfer process, resulting in higher conductivity.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Physics, Applied
Sourav Chowdhury, R. J. Choudhary, D. M. Phase
Summary: Experimental results show that the spin-blockade phenomenon in SrCoO2.5 thin films increases with the decrease in charge-disproportionation and O-2p hole density. This provides a fundamental understanding of the spin-blockade phenomena in both traditional and unusual charge-ordered systems.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Amr Ghazy, Jonas Ylonen, Nagarajan Subramaniyam, Maarit Karppinen
Summary: We have developed a novel atomic/molecular layer deposition (ALD/MLD) process for europium-organic thin films using Eu(thd)3 and 2-hydroxyquinoline-4-carboxylic acid (HQA) precursors. The resulting Eu-HQA thin films demonstrate high growth rate and exhibit red Eu3+ luminescence with extended excitation wavelength range up to about 400 nm, attributed to the sensitizer role of organic HQA. These films are further deposited on nanoplasmonic structures to achieve twentyfold enhanced emission intensity. Moreover, we demonstrate the potential of Eu-HQA coated nanoplasmonic structures in novel bioimaging applications through FRET-type energy transfer process with commercial Alexa647 fluorophor.
Article
Multidisciplinary Sciences
Peiliu Li, Xianfu Huang, Ya-Pu Zhao
Summary: In this study, an electro-capillary peeling strategy was developed to achieve thin film detachment by driving liquid to percolate and spread into the bonding layer. This method significantly reduced deformation and strain of the film compared to traditional methods. The approach showed active control capabilities and was suitable for a broad range of films.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Peiliu Li, Xianfu Huang, Ya-Pu Zhao
Summary: Thin films are widely used functional materials. Researchers have developed an electro-capillary peeling strategy that achieves nondestructive detachment of thin films by applying electric fields, reducing film deformation. This method has a wide range of applications for various films.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Dong-Hui Chen, Ritesh Haldar, Christof Woell
Summary: In this study, a series of continuous, low-thickness lanthanide-MIL-103 SURMOFs were fabricated using a layer-by-layer (LbL) approach in the liquid-phase epitaxy process. These Ln-SURMOFs exhibit highly sensitive thermometers with optical readout, which can be observed with the naked eye. High transmittance is achieved by precisely controlling the film thickness and quality of these Ln-SURMOF thermometers. Moreover, the thermal sensitivity in the temperature regime above 120 K can be improved by controlling the energy transfer between Tb(III) and Eu(III) through a sophisticated supramolecular architecture, namely MOF-on-MOF heteroepitaxy.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Polymer Science
Sherif Madkour, Marcel Gawek, Andreas Hertwig, Andreas Schoenhals
Summary: The thermodynamic behavior of thin PVME films with an irreversible adsorbed layer on the substrate was studied. Various techniques, including leaching, AFM, ellipsometry, and dielectric spectroscopy, were used to investigate growth kinetics, critical film thickness, influence on glass transition temperature, and molecular dynamics of the adsorbed layer. The study revealed strong percolation effects of the adsorbed layer on thin films.
Article
Engineering, Electrical & Electronic
M. A. Elistratova, I. B. Zakharova
Summary: This study investigates the temperature effects on the optical properties of porphyrin materials and finds that the behavior varies among different materials. These findings are of great significance for the research and applications of porphyrin materials.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Mulugeta Tesema Efa, Jheng-Chang Huang, Toyoko Imae
Summary: This study reports on enhancing the performance of DSSCs through the use of cascade FRET phenomenon, including the use of composites with carbon dot (Cdot) to increase the power conversion efficiency. Utilizing a photosensitized system based on cascade FRET can enhance the light-harvesting properties of DSSCs.
Article
Optics
S. Koutsares, L. S. Petrosyan, S. Prayakarao, D. Courtwright, C. E. Bonner, T. Shahbazyan, M. A. Noginov
Summary: We explored emission kinetics of dye-doped polymeric films on glass and silver, finding concentration quenching near the metallic surface. Theoretical models were used to explain the observed phenomena in Fabry-Perot cavities.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Manuel Romero, Juan Ramon Sanchez-Valencia, Gabriel Lozano, Hernan Miguez
Summary: In this work, we investigate the impact of the optical environment on the radiative decay rate of rare-earth transitions in luminescent nanoparticles forming a thin film, both theoretically and experimentally. By using electric dipole sources in simulations, we analyze the effect of modifying the effective refractive index of transparent layers made of phosphor nanocrystals doped with rare earth cations, and propose a correction to analytical models for calculating the radiative decay rate. Our experimental results validate the theoretical predictions and demonstrate precise tuning of the emission.
Article
Chemistry, Multidisciplinary
Manuel Romero, Juan Ramon Sanchez-Valencia, Gabriel Lozano, Hernan Miguez
Summary: This work investigates the influence of the optical environment on the radiative decay rate of rare-earth transitions in luminescent nanoparticles forming a thin film, both theoretically and experimentally. By using finite-difference time-domain simulations and experiments, we propose modifications to existing analytical models for calculating the radiative decay rate and successfully achieve gradual and controllable alteration of the effective refractive index in luminescent films. Our research provides valuable insights for the rational tuning of the spontaneous decay rate and photoluminescence quantum yield in luminescent nanoparticle ensembles.
Review
Chemistry, Multidisciplinary
Dan He, Yawen Li, Fuwen Zhao, Yuze Lin
Summary: High trap density in organic solar cells leads to localized charge carriers and reduced carrier lifetime, limiting device efficiency. This feature article summarizes the recent advances of trap suppression by material design and device engineering.
CHEMICAL COMMUNICATIONS
(2024)
Review
Chemistry, Multidisciplinary
Olivier Monfort, Arshitha Madhusudhan, Martin Motola
Summary: This article presents the advantages of coupling photocatalysis and Fenton-based processes for environmental remediation and discusses their synergy. It critically examines the simultaneous triggering of these two processes and provides insights into research approaches. The study aims to enhance understanding of this complex process and highlight the potential integration of new catalysts in current wastewater treatment technology.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Manideepa Dhar, Chittaranjan Mishra, Avijit Das, Uttam Manna
Summary: An approach of 'polymerization of monomers in its aggregated form' has been introduced to tailor the water wettability of fibrous and porous substrates, achieving hydrophobicity to superhydrophobicity transition, as well as patterned wettability. This facile chemical method provides a durable coating with adjustable and patterned wettability for various potential applications.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Saswat Ranjan Bhoi, Chhanda Debnath, Shikha Gandhi
Summary: In this article, a novel catalytic reaction using Pd(0) and Bronsted acid is reported for the synthesis of biologically important imidazolidinone-fused N-heterocycles through redox-neutral intramolecular N-allylation of indoles and pyrroles with alkynes. This atom-economical method is applicable to a wide range of substrates and eliminates the need for leaving groups or oxidizing agents commonly used in traditional allylation reactions.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Longkun Chen, Mingshuai Zhang, Meichen Liu, Zhuoyuan Liu, Yuetong Qiu, Zhilai Zhang, Fuchao Yu, Jiuzhong Huang
Summary: In this study, an efficient Rh(III)-catalyzed selective mono- and dual-C-H bond functionalization/cyclization with iodonium ylide as the sole coupling partner was demonstrated. Fused benzodiazepine skeletons were obtained in excellent yields, providing an improved approach to dual C-H unsymmetrical functionalization.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Alice Kennett, Sven Epple, Gabriella van der Valk, Irene Georgiou, Evelyne Gout, Romain R. Vives, Angela J. Russell
Summary: This study presents the design and synthesis of sulfated disaccharide inhibitors based on IdoA(2S)-GlcNS(6S), which showed potent inhibition of Sulf-2. The results suggest that IdoA(2S)-GlcNS(6S) is the shortest fragment size required for effective inhibition of Sulfs, and a trisulfated disaccharide is identified as the minimal fragment size of heparan sulfate for effective endosulfatase inhibition.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Mauro Garbini, Andrea Brunetti, Riccardo Pedrazzani, Magda Monari, Massimo Marcaccio, Giulio Bertuzzi, Marco Bandini
Summary: The self-adaptability of galvanostatic electrolysis was found to be helpful in a multistage chemo- and diastereoselective electrochemically promoted cyclodimerization of chalcones. Through a series of reductive events, densely functionalized cyclopentanes with five contiguous stereocenters were obtained (25 examples, yields up to 95%, dr values up to >20:1). Further experimental and electrochemical investigations indicated the crucial role of dynamic kinetic resolution of the aldol intermediate in the reaction mechanism.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Dhananjay S. Nipate, Neha Meena, Prakash N. Swami, Krishnan Rangan, Anil Kumar
Summary: In this study, the synthesis of functionalized benzo[a]phenazines and indazolo[2,3-a]quinolines was achieved through Rh(III)-catalyzed oxidative annulation of 2-arylquinoxalines and 2-aryl-2H-indazoles with allyl alcohols. The method showed a wide substrate scope, excellent functional group tolerance, good to high yields of annulated products, and the capability for scaled-up synthesis. A tentative mechanism of the annulation reaction was proposed based on a preliminary mechanistic investigation.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Ruonan Zhang, Abudukadi Tudi, Xia Yang, Xuping Wang, Zhihua Yang, Shujuan Han, Shilie Pan
Summary: A new lead tellurium borate material with a unique fundamental building block [B4O10] was synthesized and found to exhibit high birefringence. The structure-property relationship was discussed using first-principles calculations.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Amresh Kumar Singh, Baishali Thakurta, Anupam Giri, Monalisa Pal
Summary: This study introduces three key concepts for the quick synthesis of large-scale high-quality 2D materials films and their utilization in device fabrication.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Reina Hagiwara, Shun Nishimura, Kosuke Okeyoshi
Summary: A copolymer-conjugated nanocatalytic system has been developed to improve electron transfer and enhance photoinduced H2 generation.
CHEMICAL COMMUNICATIONS
(2024)