Article
Chemistry, Applied
Daniel Zuniga-Nunez, Francisco Mura, Nory Marino-Ocampo, Patricio Briones-Rebolledo, Horacio Poblete, Jean-Maurice Mallet, Denis Fuentealba, Alexis Aspee
Summary: A fluorescent probe C-DMPE was synthesized to monitor interfacial membrane properties. The probe showed shorter fluorescence lifetimes and rotational correlation times in mixed vesicles containing DPPC and DOPC, indicating favorable sensing of lipid domain boundaries.
Article
Biochemical Research Methods
Gilad Yahav, Shweta Pawar, Yitzchak Weber, Bar Atuar, Hamootal Duadi, Dror Fixler
Summary: Wide-field measurements of time-resolved fluorescence anisotropy (TR-FA) provide valuable information about the rotational mobility of fluorophores and have potential applications in cellular imaging and biochemical sensing. This study extends the existing fluorescence lifetime imaging microscopy (FLIM) to include TR-FA imaging (TR-FAIM), and applies it to the study of CD-gold nano conjugates. The results show significant changes in FLT, r, and. due to the attachment of gold nanoparticles to CDs.
JOURNAL OF BIOMEDICAL OPTICS
(2023)
Article
Chemistry, Physical
Paloma Lizondo-Aranda, Lara Martinez-Fernandez, Miguel A. Miranda, Roberto Improta, Thomas Gustavsson, Virginie Lhiaubet-Vallet
Summary: Joint femtosecond fluorescence upconversion experiments and theoretical calculations provide unprecedented characterization and understanding of the mutagenic etheno adduct εdC excited state relaxation. The fluorescence behavior of εdC is modified compared to dC, with increased lifetime and quantum yield. Quantum mechanical calculations reveal the involvement of a conical intersection in the nonradiative decay pathway, which explains the unique fluorescence properties of εdC and εdCH(+).
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Optics
Daniil A. Gvozdev, Alexey N. Semenov, Georgy V. Tsoraev, Eugene G. Maksimov
Summary: Determining the rate of rotation of molecules using fluorescence anisotropy decay curves is a powerful method in biological applications. However, the nonlinearity in the photon counting rate on fluorescence intensity flux can cause distortions in the determination of fluorescence anisotropy lifetime and asymptotic fluorescence anisotropy. This study investigated the effects of this nonlinearity and its dependence on temperature, as well as its manifestation in the case of photobleaching of the fluorophores.
Article
Chemistry, Physical
Anthony V. Sica, Ash Sueh Hua, Helen H. Lin, Ellen M. Sletten, Timothy L. Atallah, Justin R. Caram
Summary: We demonstrate a method called Spectrally selective Time-resolved Emission through Fourier-filtering (STEF) for separating and resolving the dynamics of multiple emitters without using conventional filters. Our approach utilizes a fixed path-length imbalanced Mach-Zehnder interferometer to interfere and cancel (or enhance) specific spectral signatures corresponding to one emissive species. We show the range and utility of STEF by performing various procedures, including filtering laser scatter, separating fluorescence lifetimes, and resolving overlapping fluorescent stains.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Applied
Zhentao Hou, Trevor M. Tumiel, Todd D. Krauss
Summary: Single-molecule microscopy was used to observe photoluminescence brightening of individual sodium-dodecyl-sulfate-wrapped single-walled carbon nanotubes upon the addition of dithiothreitol. The photoluminescence enhancement varied for each nanotube, and longer nanotubes showed a uniform brightening phenomenon along their length.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Biochemistry & Molecular Biology
Alexey N. Semenov, Danil A. Gvozdev, Dmitry Zlenko, Elena A. Protasova, Anastasia R. Khashimova, Evgenia Yu Parshina, Adil A. Baizhumanov, Natalia Yu Lotosh, Eleonora E. Kim, Yuriy N. Kononevich, Alexey A. Pakhomov, Alla A. Selishcheva, Nikolai N. Sluchanko, Evgeny A. Shirshin, Eugene G. Maksimov
Summary: This study investigated the delivery mechanism of ECN by cyanobacterial carotenoprotein AnaCTDH. By using fluorescence probes and molecular dynamics simulation, new approaches for assessing the efficiency of carotenoid delivery were proposed.
Article
Chemistry, Physical
Paraic M. Keane, Clara Zehe, Fergus E. Poynton, Sandra A. Bright, Sandra Estayalo-Adrian, Stephen J. Devereux, Paul M. Donaldson, Igor V. Sazanovich, Michael Towrie, Stanley W. Botchway, Christine J. Cardin, D. Clive Williams, Thorfinnur Gunnlaugsson, Conor Long, John M. Kelly, Susan J. Quinn
Summary: In this study, the interactions of metal-free TMPyP4 and Pt(ii)TMPyP4 with guanine-containing nucleic acids were investigated using time-resolved infrared spectroscopy (TRIR) for the first time. The results showed that both compounds bound close to guanine, and electron transfer occurred when D(2)TMPyP4 was bound to guanine-containing systems.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Optics
Leepsa Mishra, Ranjan Kumar Behera, Aradhana Panigrahi, Kallol Bera, Manas Kumar Sarangi
Summary: The quantum confinement effect plays a critical role in nanoscale materials, affecting their dimensions and photophysical properties. N-doped carbon dots show tunable fluorescence and optical properties, but the choice of precursor and doping significantly influence their solubility, diffusivity, and quantum yield.
Article
Chemistry, Multidisciplinary
Gilad Yahav, Shweta Pawar, Anat Lipovsky, Akanksha Gupta, Aharon Gedanken, Hamootal Duadi, Dror Fixler
Summary: This study utilized pH- and polarity-sensitive nanomaterials to monitor intracellular pH, polarity, and viscosity. The functional groups on the surface of these nanomaterials exhibited sensitivity to changes in the microenvironment, leading to variations in fluorescence intensity and lifetime. The integrated time-resolved fluorescence anisotropy imaging and fluorescence lifetime imaging microscopy allowed for simultaneous monitoring of pH and polarity changes through fluorescence lifetime imaging and viscosity variations through time-resolved fluorescence anisotropy imaging.
Article
Multidisciplinary Sciences
Karina Matveeva, Andrey Zyubin, Elizaveta Demishkevich, Vladimir Rafalskiy, Ekaterina Moiseeva, Igor Kon, Anna Kundalevich, Viktoria Butova, Ilia Samusev
Summary: This study provides a detailed analysis of spectral and time-resolved photoprocesses in human platelets and their complexes with platinum nanoparticles, revealing the possibility of energy transfer between Pt NPs and the platelet membrane. The potential application of Pt NPs in quenching-based sensing for pathology diagnosis based on platelet conformations related to cardiovascular diseases is demonstrated.
Article
Biophysics
Fiona Gordon, Yannick Casamayou-Boucau, Alan G. Ryder
Summary: Studying the interaction between plasma proteins and liposomes is critical for drug delivery systems. This study explored the efficacy of ARMES for investigating the interaction of human serum albumin (HSA) with liposomes and compared it to conventional spectroscopic techniques. The findings provide useful information for understanding the interaction mechanisms.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Shengnan Xu, Rao Wei, Zhong Chen, Peng Ma, Guifen Qiang, Haisheng Peng, Hai-Yu Hu
Summary: A novel long-lived fluorescence micelle nanoprobe was constructed to visualize the formation process and dynamics of lipid droplets in living tumor cells and adipocytes, exhibiting low cytotoxicity, high cytomembrane permeability, and high selectivity, with great potential to improve signal-to-noise ratio in time-resolved fluorescence imaging.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Multidisciplinary
Mikkel B. Liisberg, Vanessa Ruck, Tom Vosch
Summary: Burst-mode Time Gated Fourier Transform Spectroscopy is a technique that can simultaneously capture and disentangle emission signals from different lifetime states. The technique is showcased using DNA-stabilized silver nanoclusters, demonstrating its potential.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Mingyue Cui, Peiling Dai, Jiali Ding, Manjing Li, Rong Sun, Xin Jiang, Menglin Wu, Xueke Pang, Mingzhu Liu, Qiang Zhao, Bin Song, Yao He
Summary: This article introduces a probe with ultralong phosphorescence lifetime for millisecond-range time-resolved bioimaging, which demonstrates high signal-to-background ratio in imaging live cells and deep tumor tissue in mice.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Cardiac & Cardiovascular Systems
Rithy Srey, Geoffrey Rance, John Handrahan, Trevor Smith, Kay B. Leissner, Marco A. Zenati
Summary: Using FEO2 to monitor oxygen delivery is more reliable than FiO(2) monitoring and can promptly detect issues with oxygen delivery. An alarm can be set to alert the perfusionist if FEO2 falls below a predetermined threshold.
Article
Chemistry, Multidisciplinary
Peng Zeng, Xinjian Ren, Linfeng Wei, Haifeng Zhao, Xiaochun Liu, Xinyang Zhang, Yanmin Xu, Lihe Yan, Klaus Boldt, Trevor A. Smith, Mingzhen Liu
Summary: In this study, the cooling rate of hot carriers in CsPbBr3 nanocrystals was found to be three times lower when capped with a cross-linked polysiloxane shell compared to single alkyl-chain oleylamine ligands. Measurements using cryogenic photoluminescence spectroscopy revealed the strength of carrier-phonon coupling in the two samples. The effect of organic ligands on the coupling process was explained using a damped oscillation model, which also accounted for the observed linear temperature-dependence.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Fei Zheng, Dechan Angmo, Christopher R. Hall, Sergey Rubanov, Fangfang Yuan, Jamie S. Laird, Mei Gao, Trevor A. Smith, Kenneth P. Ghiggino
Summary: This study reports the formation mechanism and structure characteristics of tree-shaped dendrites in quasi-2D perovskite films doped with MACl. The dendrites are assembled from large-n RPPs-dominated grains, while the nondendritic area is composed of small-n RPPs grains and associated with film surface pits caused by the evaporation of MACl.
ADVANCED MATERIALS INTERFACES
(2022)
Review
Optics
Xiaochun Liu, Peng Zeng, Shuhan Chen, Trevor A. Smith, Mingzhen Liu
Summary: This paper reviews the studies on the photoinduced charge transfer process in CsPbX3 perovskite nanocrystals, primarily using femtosecond transient absorption spectroscopy. The concerns of CT rates or efficiency characterization in measurements are discussed, along with an elucidation of plasmon-induced hot electron transfer. These investigations provide valuable insights for the development of CsPbX3-based hot carrier devices.
LASER & PHOTONICS REVIEWS
(2022)
Article
Nanoscience & Nanotechnology
Fei Zheng, Thomas Raeber, Sergey Rubanov, Calvin Lee, Aaron Seeber, Christopher Hall, Trevor A. Smith, Mei Gao, Dechan Angmo, Kenneth P. Ghiggino
Summary: This study reveals the spontaneous formation of a self-assembled butylammonium ligand capping layer on the top surface of a quasi-2D perovskite film and explains the assembly and vertical orientation of RPPs in the film, which is crucial for the performance of 2D perovskite solar cells. These findings provide important insights for the development of high-performance perovskite solar cells and other solid-state electronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Can Gao, Atul Shukla, Haikuo Gao, Zhagen Miao, Yihan Zhang, Pu Wang, Guiwen Luo, Yi Zeng, Wallace W. H. Wong, Trevor A. Smith, Shih-Chun Lo, Wenping Hu, Ebinazar B. Namdas, Huanli Dong
Summary: Organic light-emitting transistors (OLETs) have demonstrated great potential applications in various fields as highly integrated and minimized optoelectronic devices. However, the construction of high-performance OLETs remains a significant long-term challenge, especially for single component active layer OLETs. In this study, the successful harvesting of triplet excitons in a high mobility emissive molecule, 2,6-diphenylanthracene (DPA), through the triplet-triplet annihilation process is demonstrated.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Analytical
Arunkumar Kathiravan, Sekar Thulasi, Trevor A. Smith, Muthupandian Ashokkumar, Mariadoss Asha Jhonsi
Summary: This study successfully converts the carcinogenic Congo red dye into environmentally friendly fluorescent carbon dots (CDs) through a hydrothermal method. The synthesized CDs exhibit excellent fluorescence properties and biocompatibility. They selectively respond to Fe3+ ions and can be used for real-time detection using a paper-based analytical tool.
Article
Chemistry, Physical
Anjay Manian, Rohan J. Hudson, Pria Ramkissoon, Trevor A. Smith, Salvy P. Russo
Summary: This benchmarking study investigates non adiabatic matrix coupling elements (NACMEs) using different density functionals, with a focus on the photophysical properties of perylene in toluene. The study compares theoretical calculations with experimental results, deriving relations between TDDFT and DFT/MRCI properties and identifying the most promising data sets.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Physics, Multidisciplinary
Subhajit Chakraborty, Yang Xu, Ann Roberts, Debabrata Goswami, Trevor A. Smith
Summary: Evanescent wave-induced fluorescence spectroscopy (EWIFS) is a widely used technique for studying complex media in physical, chemical, and biological sciences. It utilizes the evanescent wave generated by total internal reflection to probe the photoluminescence characteristics of the sample. However, it faces limitations in imaging samples with higher refractive indices.
Article
Chemistry, Multidisciplinary
Michael Wilms, Lesly V. Melendez, Rohan J. Hudson, Christopher R. Hall, Samantha Prabath Ratnayake, Trevor Smith, Enrico Della Gaspera, Gary Bryant, Timothy U. Connell, Daniel E. Gomez
Summary: We introduce a novel composite material composed of silver nanoparticles and three-dimensional molecular organic cages based on light-absorbing porphyrins. The porphyrin cages not only stabilize the particles but also enable diffusion and trapping of small molecules near the metallic surface. The combination of these two photoactive components leads to a Fano-resonant interaction, resulting in increased energy transfer and enhanced photocurrent for water-splitting applications. This composite structure demonstrates the potential of advanced photosensitizer systems with intrinsic porosity for photocatalytic and sensing applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Anjay Manian, Francesco Campaioli, Rohan J. Hudson, Jared H. Cole, Timothy W. Schmidt, Igor Lyskov, Trevor A. Smith, Salvy P. Russo
Summary: The role of charge transfer states in multi-exciton mechanisms is difficult to model accurately, but the intermolecular packing has been shown to heavily influence these mechanisms. By studying a gas phase perylene dimer, it was found that displaced geometries yield large charge transfer contributions for singlet fission, while triplet-triplet annihilation charge transfer couplings are weak. Slipping of the dimer cofacial geometry is beneficial to both charge transfer-mediated processes within a wavefunction overlap scheme. The results provide insights into singlet fission and can guide further investigations in this field.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Trevor A. Smith, Rohan J. Hudson, Anjay Manian, Christopher R. Hall, Timothy W. Schmidt, Salvy P. Russo, Kenneth P. Ghiggino
Summary: Gating logical operations through high-lying excited states of perylene has potential for the development of ultrafast, subnanometer computational devices. This study uses femtosecond spectroscopy and quantum chemical calculations to investigate the relaxation dynamics of monomeric perylene's higher electronic excited states. The obtained lifetimes of the 2(1)Ag and 2(1)B(2u) states suggest that these states could be useful for logical operations.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yixiong Ji, Wangxian Chen, Di Yan, James Bullock, Yang Xu, Zhenghua Su, Wentong Yang, Jamie Stuart Laird, Tian Zheng, Na Wu, Wusong Zha, Qun Luo, Chang-Qi Ma, Trevor A. Smith, Fangyang Liu, Paul Mulvaney
Summary: Photovoltaic thin film solar cells based on CZTSSe have limited efficiency due to the deficit in open circuit voltage. The proposed ZAZA window structure offers improved optoelectronic properties and carrier collection efficiency, resulting in a significant enhancement of VOC. These advances enable the fabrication of high-efficiency CZTSSe solar cells without the need for an anti-reflective coating.
Article
Nanoscience & Nanotechnology
Nikolina Kalcec, Nikolina Peranic, Ivan Mamic, Maja Beus, Christopher R. Hall, Trevor A. Smith, Marc Antoine Sani, Petra Turcic, Frances Separovic, Ivana Vinkovoic Vrcek
Summary: This study aims to improve the delivery of drugs for Parkinson's disease treatment by designing two different types of selenium nanoparticles (SeNPs). The results show that PVP-SeNPs have strong binding capacity with L-DOPA and dopamine. Additionally, the formation of protein corona plays a crucial role in the design of drug nanodelivery systems.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Organic
Joses G. G. Nathanael, Bing Yuan, Christopher R. R. Hall, Trevor A. A. Smith, Uta Wille
Summary: Absolute second-order rate coefficients for the reaction of N- and C-protected amino acids with triethylamine-derived aliphatic peroxyl radical TEAOO were determined using laser flash photolysis. The reactions proceeded via radical hydrogen atom transfer (HAT) from the C alpha position, and the rate was determined by the exothermicity of the reaction. The preferred pathway for Ac-Tyr-OMe was HAT from the phenolic OH group, which shut down when hydrogen bonding with an amine occurred.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
