Article
Chemistry, Analytical
Qiang Zhao, Yunjiao Wang, Bangyong Sun, Deqiang Wang, Gang Li
Summary: This research presents a dielectrophoretic manipulation technique based on nanogap electrodes, which allows for the capture, enrichment, and sorting of nanometer-sized objects in liquids. The technique shows potential applications in micro/nanofluidics and provides an alternative method for the non-invasive manipulation and characterization of nanoparticles such as DNA, proteins, and viruses.
Article
Chemistry, Physical
Yanchen Wang, Jiaxin Liu, Aifei Wang, Song Gao, Zihao Li, Junjie Li, Suhao Yan, Suwen Cheng, Zhicheng Song, Yupeng Zhang, Jingjin Dong, Jiupeng Cao, Fangfang Wang, Wei Huang, Tianshi Qin
Summary: Optical image encryption technology provides valuable applications in information storage and protection by controlling emission using specific wavelengths. In this study, sandwiched heterostructural nanosheets consisting of perovskite frameworks and polycyclic aromatic hydrocarbons were investigated. These nanosheets exhibited blue emissions under UVA-I irradiation, but showed different photoluminescent properties under UVA-II. The emission in Tp-PSK was attributed to fluorescence resonance energy transfer, while photoquenching was observed in Py-PSK due to competitive absorption. The unique photophysical features of these nanosheets in a narrow UV window were exploited for optical image encrypting.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Peiyu Zeng, Wenhui Wang, Dongshuang Han, Jundong Zhang, Zhihao Yu, Jiaoyan He, Peng Zheng, Hui Zheng, Liang Zheng, Weitao Su, Dexuan Huo, Zhenhua Ni, Yang Zhang, Zhangting Wu
Summary: By combining a PbS quantum dot layer with a MoS2/WSe2 heterostructure, researchers have designed a photodiode with enhanced photovoltaic response. This device exhibits broadband photovoltaic response and fast response speed.
Article
Chemistry, Physical
Indra Narayan Chakraborty, Pradyut Roy, Pramod P. P. Pillai
Summary: The effectiveness of quantum dots (QDs) in photocatalyzing organic reactions is explored in this study. The use of QDs in efficiently catalyzing olefination reactions under visible-light irradiation at room temperature is demonstrated. Spectroscopic and electrochemical studies provide insights on the charge transfer mechanism involved in QD-photocatalyzed olefination.
Article
Chemistry, Multidisciplinary
Suli Jia, Chengquan Wang, Jing Qian, Xingcai Zhang, Haining Cui, Qi Zhang, Yunmeng Tian, Nan Hao, Jie Wei, Kun Wang
Summary: This new class of 2D nanosheet-based FRET biosensor utilizes vertically oriented MoS2 nanosheets on a magnetic nanocarrier, which allows for better detection by avoiding background signal and fluctuations.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Xiaowei Yu, Kaikai Liu, Bolun Wang, Hongyue Zhang, Yuanyuan Qi, Jihong Yu
Summary: This study successfully developed a time-dependent polychrome stereoscopic luminescence system by designing a luminescence system with adjustable afterglow lifetime and multicolor quantum dots. The system allows tunable afterglow emission and has been applied in time-space division multiplexing, expanding the information capacity.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Shi-Cheng Zhu, Shen Li, Bo Tang, Hao Liang, Bi-Jian Liu, Guangcan Xiao, Fang-Xing Xiao
Summary: The 0D/2D TMCs QDs/MXene heterostructures were designed to enhance the efficiency of photocatalytic hydrogen generation and anaerobic reduction reactions by controlling the direction of charge transport. MXene acts as an effective charge mediator, reducing charge recombination and prolonging charge lifetime.
JOURNAL OF CATALYSIS
(2021)
Editorial Material
Multidisciplinary Sciences
Nico W. Hendrickx, Menno Veldhorst
Summary: This paper introduces a four-qubit quantum processor based on germanium hole spin quantum dots, demonstrating universal quantum logic on qubits arranged in a two-by-two grid and showing that spin qubits can be coupled in two dimensions.
Article
Materials Science, Multidisciplinary
Hayato Tanaka, Istvan Lagzi, Hideyuki Nakanishi
Summary: Researchers have successfully patterned PQDs using a unique method of nonuniform photopolymerization of liquid monomers. A photocurable liquid containing PQDs is illuminated with patterned light created by a digital micromirror device. The PQDs in the solution migrate and form patterns, which are imprinted on a film after photopolymerization.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Analytical
Qizhen Lai, Yucheng Liu, Lan Ge, Yeling Yang, Xinghu Ji, Zhike He
Summary: This study presents an improved MCH/DNA-Au-QD sensor with increased signal to background ratio, outperforming the original sensor and introducing a new approach for performance optimization.
ANALYTICAL METHODS
(2021)
Article
Chemistry, Multidisciplinary
Yinjuan Ren, Zhonghui Nie, Fei Deng, Ziming Wang, Siyang Xia, Yue Wang
Summary: Experimental investigation of ultrafast dynamics in CsPbBr3@ZnS core-shell nanocrystals revealed hot hole transfer and charge transfer state formation. These results demonstrate that carrier dynamics modulation can improve the performance of perovskite nanocrystals.
Article
Nanoscience & Nanotechnology
Yi-Rou Jin, Yi Liu, Feng-Lei Jiang
Summary: The study investigated the roles of TMEDA and EDA in ligand exchanges for water-soluble CdSe quantum dots, proposing a strategy to enhance quantum yield and utilizing NMR and isothermal titration calorimetry for validation.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Shao-Hai Li, Ming-Yu Qi, Yun-Yan Fan, Ye Yang, Masakazu Anpo, Yoichi M. A. Yamada, Zi-Rong Tang, Yi-Jun Xu
Summary: A novel pseudo-supramolecular assembly is developed by conjugating ultra-small nitrogen-doped carbon quantum dots with polypyridyl ruthenium, enhancing the photochemical conversion of CO2 to CO. The reversible self-assembly driven by dynamic non-covalent interactions led to superior photosensitized CO2 reduction performance, demonstrating potential for promising artificial light-harvesting systems using metal complex-based systems for photoredox-catalyzed reactions.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Tsumugi Miyashita, Paulina Jaimes, Tianquan Lian, Ming Lee Tang, Zihao Xu
Summary: The study investigates the impact of ligands on photon upconversion and finds that long-chain ligands decrease the efficiency of energy transfer, while short-chain ligands enable direct energy transfer and enhance the upconversion quantum yield.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Arun Ashokan, Paul Mulvaney
Summary: Solution-phase spectroelectrochemistry was used to study electron injection into colloidal CdSe quantum dots in THF. The results showed reversible optical changes on a time-scale of minutes, with the injection of electrons leading to quenching of photoluminescence. The number of electrons injected into the QDs depended on the electrode potential and QD size, with most injection occurring below the band edge.
CHEMISTRY OF MATERIALS
(2021)
Review
Biochemical Research Methods
Sofia Julin, Adrian Keller, Veikko Linko
Summary: Hierarchical assembly of programmable DNA frameworks, such as DNA origami, has paved the way for versatile nanometer-precise parallel nanopatterning up to macroscopic scales. However, the dynamics of large-scale lattice assembly of such modules is still poorly understood. This article focuses on the dynamics of two-dimensional surface-assisted DNA origami lattice assembly and prospective three-dimensional assemblies, and summarizes their potential applications.
BIOCONJUGATE CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Ashwin Karthick Natarajan, Joonas Ryssy, Anton Kuzyk
Summary: The DNA origami technique allows precise positioning of nanoscale objects, facilitating the development of functional nanomechanical devices for investigating DNA-protein interactions. In this study, a nanoscale device was fabricated using the DNA origami technique to study DNA bending proteins. The bending of DNA caused by the TATA-box binding protein (TBP) was observed using a transmission electron microscope, and the roles of transcription factor II A (TF(II)A) and transcription factor II B (TF(II)B) were investigated.
Article
Chemistry, Multidisciplinary
Sofia Julin, Veikko Linko, Mauri A. A. Kostiainen
Summary: DNA nanotechnology allows for the fabrication of nanometer-precise templates with various uses. While most DNA assemblies are static, there is an increasing focus on dynamic structures. The programmability of DNA enables the encoding of shape and mechanism of action of dynamic structures. However, these features are usually demonstrated on small, discrete objects rather than large-scale systems.
Article
Chemistry, Physical
Kosti Tapio, Charlotte Kielar, Johannes M. Parikka, Adrian Keller, Heini Jarvinen, Karim Fahmy, J. Jussi Toppari
Summary: In recent years, DNA has been used as a promising material for fabricating hierarchical nanostructures due to its self-assembly properties and functionalization schemes. This study demonstrates the assembly of a two-dimensional fishnet-type lattice on a silicon substrate using cross-shaped DNA origami. The effects of environmental and structural factors on lattice assembly are investigated, and a methodology for producing closely-spaced DNA origami lattices on silicon substrate is developed.
CHEMISTRY OF MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Veikko Linko, Adrian Keller
Summary: Programmable, custom-shaped, and nanometer-precise DNA origami nanostructures have been widely used in bionanotechnology and biomedicine. This review focuses on the structural stability of DNA origami under physiological conditions, exploring the molecular-level interactions and summarizing the role of different interactions in maintaining or changing the integrity and stability of DNA origami nanostructures. It also identifies specific areas that require further investigation. This review provides a primer for designing stable DNA objects and using them in applications involving physiological media.
Article
Chemistry, Multidisciplinary
Paul Williamson, Petteri Piskunen, Heini Ijas, Adrian Butterworth, Veikko Linko, Damion K. Corrigan
Summary: Electrochemical DNA (e-DNA) biosensors are effective tools for disease monitoring, as they can translate hybridization events into recordable electrical signals. In this study, a strategy for amplifying electrochemical signals associated with DNA hybridization was reported using DNA origami method, leading to an improved sensor limit of detection and high strand selectivity. This approach could address the sensitivity requirements for low-cost point-of-care devices.
Article
Physics, Applied
Aleksi Julku, Grazia Salerno, Paivi Torma
Summary: We use multiband Bogoliubov theory to study the superfluid weight, speed of sound, and excitation fraction of a flat band Bose-Einstein condensate (BEC). The superfluid weight is determined by introducing a phase twist and minimizing the free energy. Our findings reveal that the superfluid weight includes a contribution arising from the change in condensate density and chemical potential neglected in previous studies. Furthermore, we establish a connection between the speed of sound and the excitation fraction with orbital-position-independent generalizations of quantum metric and quantum distance.
LOW TEMPERATURE PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Iris Seitz, Sharon Saarinen, Esa-Pekka Kumpula, Donna McNeale, Eduardo Anaya-Plaza, Vili Lampinen, Vesa P. Hytoenen, Frank Sainsbury, Jeroen J. L. M. Cornelissen, Veikko Linko, Juha T. Huiskonen, Mauri A. Kostiainen
Summary: DNA and RNA origami nanostructures can be used to control the size, shape, and topology of virus capsids, while also protecting encapsulated origami structures from degradation.
NATURE NANOTECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Arpan Dutta, J. Jussi Toppari
Summary: Organic thin film based excitonic nanostructures have shown great potential in resonant nanophotonics as an alternative to plasmonic systems. The concentration of excitonic molecules in the film plays a crucial role in realizing surface excitonic modes and optimizing their optical performance. Our study investigates the effect of molecular concentration on various surface excitonic modes and their performance in sensing and spectroscopy. The results show that the optical performance of excitonic systems can be tuned by adjusting the molecular concentration, unlike plasmonic systems. This research provides valuable information for the development of novel excitonic nanodevices in organic nanophotonics.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Chemistry, Multidisciplinary
Johannes M. Parikka, Heini Jarvinen, Karolina Sokolowska, Visa Ruokolainen, Nemanja Markesevic, Ashwin K. Natarajan, Maija Vihinen-Ranta, Anton Kuzyk, Kosti Tapio, J. Jussi Toppari
Summary: Bottom-up methods using molecules like DNA have gained attention for the fabrication of complex nanostructures due to their low cost, high resolution, and simplicity in the third dimension. In this study, plus-shaped Seeman tile (ST) origami formed elongated 2D lattices and rolled into 3D tubes under specific ionic conditions. Imaging and further studies revealed ribbon-like structures with single or double layers of the origami lattice. The assembly process of these 3D DNA origami tubes was found to be heavily dependent on the concentration of mono- and divalent cations, with nickel acting as a trigger for tubular formation in solution.
Article
Chemistry, Multidisciplinary
Spyridon Korkos, Kai Arstila, Kosti Tapio, Sami Kinnunen, J. Jussi Toppari, Timo Sajavaara
Summary: Shape modification of embedded nanoparticles by swift heavy ion (SHI) irradiation is an effective way to produce nanostructures with controlled size, shape, and orientation. Gold nanorods embedded in SiO2 and spherical metallic nanoparticles embedded in Al2O3 were irradiated with SHI. The nanorods re-oriented along the ion beam direction, while the nanoparticles elongated. Dark-field spectroscopy revealed two discrete peaks corresponding to longitudinal and transverse modes in the elongated nanoparticles.
Article
Chemistry, Multidisciplinary
Sofia Julin, Nadine Best, Eduardo Anaya-Plaza, Eeva Enlund, Veikko Linko, Mauri A. Kostiainen
Summary: Stimuli-responsive lipid-DNA origami fibers were formed through electrostatic co-assembly of cationic lipids and 6-helix bundle (6HB) DNA origami. The photosensitive lipid degrades under UV-A light and allows controlled release of 6HBs from the fibers.
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Kukka-Emilia Huhtinen, Paivi Torma
Summary: In a multiband system, conductivity can be divided into intraband and interband contributions, with the latter further divided into symmetric and antisymmetric parts. It has been found that intraband conductivity vanishes in a flat band, while the antisymmetric interband contribution, proportional to the Berry curvature, corresponds to the anomalous Hall effect. This study investigates whether the symmetric interband conductivity, related to the quantum metric, can be finite in the zero frequency and flat band limit.
Article
Materials Science, Multidisciplinary
G. Salerno, T. Ozawa, P. Torma
Summary: This study investigates the effect of quantum geometry on the many-body ground state of one-dimensional interacting bosonic systems. The researchers find that the Drude weight is determined by the sum of the kinetic energy and a term proportional to the many-body quantum metric. Importantly, the many-body quantum metric sets the upper bound for the Drude weight. The results are validated using exact diagonalization on the Creutz ladder model. This work sheds light on the significance of many-body quantum geometry in one-dimensional interacting bosonic systems.
