Article
Chemistry, Physical
Yunmo Sung, Wonseok Lee, Eunjae Lee, Young Ho Ko, Sungjee Kim
Summary: The surface atom stoichiometry of Ag2S NCs is controlled through ion-pair ligand-assisted surface reactions. Different combinations of cation and anion pairs are studied, leading to the synthesis of cation-rich-surfaced, anion-rich-surfaced, and perfectly stoichiometric Ag2S NCs. The ion-pair-assisted surface chemistry enables the enhancement of fluorescence intensity and epitaxial growth performance of Ag2S NCs.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Melody L. Kessler, Jennica E. Kelm, Hannah E. Starr, Emma N. Cook, Joshua D. Miller, Nelson A. Rivera, Heileen Hsu-Kim, Jillian L. Dempsey
Summary: This study reports three separate ligand-based reaction mechanisms between oleate-capped PbS nanocrystals and undec-10-ene-1-thiol (UDT), and reveals how these three pathways are intertwined. Experimental evidence shows different reaction pathways occur depending on the quantity of UDT added, including Z-type displacement, L-type binding, and X-type exchange mechanisms.
CHEMISTRY OF MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Xinlu Liu, Ting Fu, Jianping Liu, Yinglin Wang, Yuwen Jia, Chao Wang, Xiaofei Li, Xintong Zhang, Yichun Liu
Summary: In this study, an efficient surface chemistry optimization of PbS CQDs for photovoltaics was achieved by annealing the CQD solution with concentrated lead halide ligands after conventional solution-phase ligand exchange. This strategy not only minimized CQD polydispersity and decreased aggregation, but also decreased trap-state density, leading to highly efficient solar cells. The research provides meaningful guidance for controlling ligand reactivity and realizing subtly purified CQDs.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Maaike M. van der Sluijs, Jara F. Vliem, Jur W. de Wit, Jeppe J. Rietveld, Johannes D. Meeldijk, Daniel A. M. Vanmaekelbergh
Summary: Cation exchange has been used to transform highly anisotropic, ultrathin, and planar PbS nanosheets into CdS nanosheets of the same dimensions. The exchange process initially results in defects, but these defects are repaired spontaneously in later stages of the exchange.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Maaike M. van der Sluijs, Jara F. Vliem, Jur W. de Wit, Jeppe J. Rietveld, Johannes D. Meeldijk, Daniel A. M. Vanmaekelbergh
Summary: This study reports on the efficient cation exchange of PbS nanosheets into CdS nanosheets, with evolution and repair occurring during the process. The resulting CdS nanosheets exhibit broad sub-band gap luminescence.
CHEMISTRY OF MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Zeger Hens
Summary: In this paper, the binding and packing of organic ligands on the surfaces of colloidal nanocrystals (NCs) are discussed, as they play a crucial role in the formation of NCs with desired properties. Due to the lack of a unique structure in NCs, a single analytical technique cannot provide a complete description of NC surface chemistry. However, solution H-1 nuclear magnetic resonance spectroscopy is highlighted as a unique method to study the ligand shell by distinguishing between surface bound species and surface inactive residues.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Chemistry, Physical
Philippe B. Green, Francisco Yarur Villanueva, Karl Z. Demmans, Christian J. Imperiale, Minhal Hasham, Ehsan Nikbin, Jane Y. Howe, Darcy C. Burns, Mark W. B. Wilson
Summary: The study identifies the native passivation of PbS-eCl NCs through 1D and 2D H-1 NMR, and reveals that the surface of these nanocrystals matches the behavior of lead halide perovskites. Through this insight, the study highlights the potential for manipulating PbS-eCl NCs in solution for wider use in optoelectronic devices.
CHEMISTRY OF MATERIALS
(2021)
Article
Physics, Applied
Seung Hyuk Lee, Keisuke Kitano, Takahiro Doe, Noboru Iwata, Makoto Izumi, Yasuhiko Arakawa, Tetsu Tatsuma
Summary: The ligand engineering of quantum dots is crucial for improving the performance of QD light-emitting diode displays. This study demonstrates that exchanging an organic ligand with an inorganic ligand can enhance stability and efficiency of QLED devices. The thinner ligand layer improves carrier injection efficiency, resulting in improved external quantum efficiency and device lifetime.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Xudong Qian, Jiongzhao Li, Xiaogang Peng
Summary: This study develops a liquid-phase IR strategy based on bi-phase digestion for quantitative determination of the most common surface ligands-alkanoate ones-in colloidal nanocrystals. Digestion converts alkanoate ligands to fatty acids that share the same carboxylic vibration modes for liquid-phase IR measurements. Different versions of the strategy are developed for ligands with different solubility and common chemicals in nanocrystal synthesis and processing.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Yan Lei, Ruijuan Qi, Jinpeng Wu, Haodan Guo, Xiangrong Li, Yanyan Fang, Dongmei Xie, Yuan Lin
Summary: The surface of InZnP CQDs has been reconstructed with PbS via a chemical engineering strategy, leading to significantly enhanced photoinduced charge carrier transfer and the performance of solid state solar cells.
JOURNAL OF POWER SOURCES
(2022)
Article
Biochemical Research Methods
Gyudong Lee, Jaejung Song, Hyunsoo Han, Donghoon Kwon, Joonhyuck Park, Sangmin Jeon, Sanghwa Jeong, Sungjee Kim
Summary: This paper demonstrates the fabrication of silica-shell-coated magnetic nanoparticle clusters (SMNCs) and subsequent surface engineering to produce zwitterionic and primary amine ligands on SMNCs. The hydrodynamic size and zeta potential of SMNC-ZW/Am can be flexibly tuned by controlling the relative amounts of zwitterionic and primary amine ligands. SMNC-ZW/Am shows higher colloidal stability and reduced nonspecific adsorption compared to bare SMNC, making it a potential antifouling nanosubstrate for separation and bioanalysis.
BIOCONJUGATE CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Zhong Fu, Likuan Zhou, Yue Yin, Kangkang Weng, Fu Li, Shaoyong Lu, Dan Liu, Wenyong Liu, Longjia Wu, Yixing Yang, Haifang Li, Lian Duan, Hai Xiao, Hao Zhang, Jinghong Li
Summary: Researchers report a new method called light-triggered, carbocation-enabled ligand stripping (CELS) to pattern quantum dot light-emitting diodes (QLEDs) with high efficiency and stability. This method shows promising results for building high-performance QLED displays and related integrated devices.
Article
Nanoscience & Nanotechnology
Jesna K. George, Shwetharani Ramu, Vishaka V. Halali, R. Geetha Balakrishna
Summary: Perovskite quantum dots (PQDs) exhibit exceptional fluorescence property and are potential candidates for fluorescent metalion sensors. The study reveals the significance of inner filter effect (IFE) in perovskite sensing systems, which enhances detection limits. Two different sensing systems for Co2+ were developed with elucidation of the fluorescence quenching mechanism, a combination of FRET and IFE, and successful modification of PQDs to reduce IFE.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Jie Chen, Chonglin Yuan, Weili Liang, Nanlin Zhang, Xiaolin Zhang, Zhiwei Wang, Chengqun Wang, Xiuting Li
Summary: The study found that the shell and core Pb(II) of PbS-PbI2 QDs can be distinguished by an electrochemical method, and the shell/core composition of the QDs can be determined based on the peak charge ratio. XPS analysis and UV-vis spectroscopy further indicated that the shell/core ratio of PbS-PbI2 QDs varies with changes in ligand PbI2 concentration.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Katie McGuire, Suhang He, Jennifer Gracie, Charlotte Bryson, Dazhong Zheng, Alasdair W. Clark, Jesko Koehnke, David J. France, Werner M. Nau, Tung-Chun Lee, William J. Peveler
Summary: This study demonstrates that aggregation of fluorescent quantum dot (QD) linked with cucurbiturils (CBs) can be broken-up by including guest molecules, while retaining CBs adsorbed on the surface. At the same time, the QD surface can be modified by the functional tail of the guest, enabling a non-covalent, click-like modification of nanoparticles in aqueous solution. This approach provides divergent routes for nano-architectures with rich functionalities for theranostics and photonics in aqueous systems.
Article
Biochemistry & Molecular Biology
Feng Gao, Alicia D. Kight, Rory Henderson, Srinivas Jayanthi, Parth Patel, Marissa Murchison, Priyanka Sharma, Robyn L. Goforth, Thallapuranam Krishnaswamy Suresh Kumar, Ralph L. Henry, Colin D. Heyes
JOURNAL OF BIOLOGICAL CHEMISTRY
(2015)
Article
Chemistry, Multidisciplinary
Benard Omogo, Feng Gao, Pooja Bajwa, Mizuho Kaneko, Cohn D. Heyes
Article
Biophysics
Rory C. Henderson, Feng Gao, Srinivas Jayanthi, Alicia Kight, Priyanka Sharma, Robyn L. Goforth, Colin D. Heyes, Ralph L. Henry, Thallapuranam Krishnaswamy Suresh Kumar
BIOPHYSICAL JOURNAL
(2016)
Article
Chemistry, Physical
Pooja Bajwa, Feng Gao, Anh Nguyen, Benard Omogo, Colin D. Heyes
Article
Chemistry, Physical
Samir V. Jenkins, Avinash Srivatsan, Kimberly Y. Reynolds, Feng Gao, Yongbin Zhang, Colin D. Heyes, Ravindra K. Pandey, Jingyi Chen
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2016)
Article
Chemistry, Physical
Marion G. Goetz, Hiroko Takeuchi, Matthew J. Goldfogel, Julia M. Warren, Brandon D. Fennell, Colin D. Heyes
JOURNAL OF PHYSICAL CHEMISTRY B
(2014)
Article
Chemistry, Physical
Anh T. Nguyen, Feng Gao, Dustin Baucom, Colin D. Heyes
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Biophysics
Dustin R. Baucom, Mercede Furr, Vivek Govind Kumar, Patience Okoto, James L. Losey, Ralph L. Henry, Mahmoud Moradi, Thallapuranam Krishnaswamy Suresh Kumar, Colin D. Heyes
Summary: The study reveals that Alb3-Cterm contains transient secondary structure in certain motifs, which may play a crucial role in its recognition and binding to the transit complex. The excellent agreement between experimental and computational data allowed for the successful prediction of the apparent unfolding free energy of this secondary structure.
BIOPHYSICAL JOURNAL
(2021)
Article
Biochemical Research Methods
Mamello Mohale, Ravi Kumar Gundampati, Thallapuranam Krishnaswamy Suresh Kumar, Colin D. Heyes
Summary: This study investigated the binding of human fibroblast growth factor-1 (hFGF1) to its receptor and heparin, as well as the application of fluorescence imaging in studying protein interactions. Two different regions of the protein were labeled to study the effect of dye structure on labeling efficiency. High or low flexibility in either the protein labeling site or the dye structure affected the labeling efficiency, while too much rigidity resulted in protein aggregation. Importantly, site-specific labeling maintained biological activity.
ANALYTICAL BIOCHEMISTRY
(2022)
Article
Chemistry, Medicinal
Mitchell Benton, Mercede Furr, Vivek Govind Kumar, Adithya Polasa, Feng Gao, Colin David Heyes, Thallapuranam Krishnaswamy Suresh Kumar, Mahmoud Moradi
Summary: The novel protein cpSRP43 plays a unique role in the post-translational chloroplast signal recognition particle (cpSRP) targeting pathway. It acts as a chaperone to LHCPs and can dissolve LHCP aggregates without external energy input. Through computational and experimental techniques, the study reveals that cpSRP43 is simultaneously highly stable and flexible, with different conformations and dynamics when bound to cpSRP54.
JOURNAL OF CHEMICAL INFORMATION AND MODELING
(2023)
Article
Chemistry, Multidisciplinary
Feng Gao, Pooja Bajwa, Anh Nguyen, Colin D. Heyes
Meeting Abstract
Chemistry, Multidisciplinary
Pooja Bajwa, Feng Gao, Benard Omogo, Colin Heyes
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2015)
Article
Materials Science, Multidisciplinary
R. Vasan, F. Gao, M. O. Manasreh, C. D. Heyes