Article
Materials Science, Multidisciplinary
Andrew A. Marder, James Cassidy, Dulanjan Harankahage, Jacob Beavon, Luis Gutierrez-Arzaluz, Omar F. Mohammed, Aditya Mishra, Austen C. Adams, Jason. D. Slinker, Zhongjian Hu, Stephen Savoy, Mikhail Zamkov, Anton V. Malko
Summary: Compared to zero-dimensional (0D) semiconductor quantum dots, 2D semiconductor nanoplatelets (NPLs) offer a spectrally narrow luminescence and superior absorption coefficients. However, optical devices based on NPLs still suffer from nonradiative Auger decay, which limits the efficiency of various processes. In this study, it is demonstrated that Auger recombination is strongly suppressed in spherically shaped nanoplatelets called quantum shells (QSs), leading to improved performance in terms of biexciton emission yield, amplified spontaneous emission, and electroluminescence enhancement. These results are significant for the development of solution-processed colloidal lasers and LEDs.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Ying Tang, Qilin Qin, Hongyu Yang, Shengnan Feng, Chunfeng Zhang, Jiayu Zhang, Min Xiao, Xiaoyong Wang
Summary: This study demonstrates the ability to decrease the Auger decay and radiative rates in semiconductor nanocrystals by applying external electric fields. The decrease in the Auger rate is attributed to enhanced exciton-exciton repulsion, while the decrease in the radiative rate is attributed to weakened electron-hole exchange interaction. These findings highlight the potential of using external electric fields as a post-synthetic approach to manipulate the exciton recombination dynamics in semiconductor nanocrystals.
Article
Chemistry, Multidisciplinary
Alexandra Brumberg, Nicolas E. Watkins, Benjamin T. Diroll, Richard D. Schaller
Summary: Colloidal semiconductor nanocrystals, such as CdSe nanoplatelets and quantum dots, offer advantages in optoelectronics but are affected by rapid nonradiative Auger recombination at high excitation intensities. This study investigates the temperature dependence of excited state lifetime and fluence-dependent emission, revealing fundamental differences between CdSe nanoplatelets and core-only quantum dots, and highlighting the increased utility of photogenerated excitons and multiexcitons at low temperatures.
Article
Chemistry, Multidisciplinary
Sergii Morozov, Stefano Vezzoli, Alina Myslovska, Alessio Di Giacomo, N. Asger Mortensen, Iwan Moreels, Riccardo Sapienza
Summary: Giant shell CdSe/CdS quantum dots exhibit high brightness and flexibility, with near-unity quantum yield and suppressed blinking. However, their single photon purity is reduced due to efficient multiexcitonic emission. In this study, we observed a significant blueshift in the photoluminescence biexciton spectrum of pure-phase wurtzite quantum dots. By using spectral filtering, we achieved a 2.3 times reduction in biexciton quantum yield while preserving 60% of the exciton single photon emission, leading to an improvement in purity from g2(0)=0.07±0.01 to g2(0)=0.03±0.01. Furthermore, at higher pump fluence, the spectral purification was even more effective, resulting in up to a 6.6 times reduction in g2(0) by suppressing higher order excitons and shell states with larger blueshifts.
Article
Chemistry, Physical
Nina N. Kurus, Alexander G. Milekhin, Roman Sklyar, Bedil M. Saidzhonov, Roman B. Vasiliev, Sergei Adichtchev, Nikolai Surovtsev, Alexander Latyshev, Dietrich R. T. Zahn
Summary: The phonon spectra of core/shell CdSe/CdS nanoplatelets with different shell thicknesses were studied, revealing frequency shifts of optical modes as the shell thickness increases, which can be explained in terms of the stress state in the core and shell, as well as the influence of phonon confinement.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Jiakuan Zhang, Chuyue Li, Jiongzhao Li, Xiaogang Peng
Summary: Size- and shape-controlled CdSe/ZnSe core/shell and CdSe/ZnSe/ZnS core/shell/shell nanocrystals with zinc-blende structure are synthesized. The ligand strain between the inorganic crystal surface and organic ligands plays a key role in ZnSe epitaxy. The lattice strain between the CdSe and ZnSe affects the photoluminescence of CdSe/ZnSe/ZnS core/shell/shell QDs.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Sander J. W. Vonk, Freddy T. Rabouw
Summary: Experiments have shown temporal fluctuations in the emission efficiency of single colloidal quantum dots (QDs), known as blinking, which are caused by the opening/closing of charge-carrier traps and/or charging/discharging of the QD. In this study, the fluctuations of biexciton efficiency in single CdSe/CdS/ZnS core-shell QDs were quantified. It was found that the biexciton efficiency blinked significantly. The charging of a QD accelerates Auger recombination, while opening/closing of a charge-carrier trap increases the nonradiative recombination rate. A revised model based on reversible trapping was proposed to explain the fast rate of trap-assisted recombination. The implications of biexciton blinking for lasing applications were also discussed.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Hairui Lei, Tenghui Li, Jiongzhao Li, Jie Zhu, Haibing Zhang, Haiyan Qin, Xueqian Kong, Linjun Wang, Xiaogang Peng
Summary: This study investigates facet reconstruction of colloidal wurtzite CdSe/CdS core/shell nanocrystals under typical synthetic conditions and reveals that two sets of facets with specific low-index facets can be reversibly reconstructed by switching the ligand system, indicating their thermodynamic stability. The atomic structures of the low-index facets of wurtzite nanocrystals are diverse, and each facet is paired with a common ligand in the solution. The results suggest that facet-controlled nanocrystals can be synthesized by optimal facet-ligand pairing, enabling the formation of semiconductor nanocrystals with size-dependent properties at an atomic level.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Dongdong Chen, Hairui Lei, Chenqi Zhu, Xing Chen, He Tian, Wei Fang, Haiyan Qin, Xiaogang Peng
Summary: In this study, pre-synthesized CdSe/CdS core/shell quantum dots were fused together in solution to form CdS nanoplatelets with multiple embedded CdSe quantum dots. The resulting structure exhibited homogeneous-free optical properties and demonstrated unique and complex excitonic characteristics.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Xiaolan Zhou, Chaodan Pu
Summary: Surface reconstruction is used to synthesize nonpolar facets CdSe/CdS core/shell quantum dots with a dodecahedral zinc-blende structure. The successful surface reconstruction is found to be assisted by a proton shuttle.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Yonglei Sun, Hua Zhu, Na Jin, Ou Chen, Jing Zhao
Summary: Lifetime blinking, a phenomenon of fluctuations in the fluorescence lifetime of a single quantum dot over time while its fluorescence intensity remains relatively stable, has been reported in a few QD systems. In this study, statistical methods demonstrate that compact CdSe/CdS core/shell QDs also exhibit short-lived lifetime blinking events, possibly due to the activation of efficient nonradiative processes leading to intensity blinking.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
S. Son, S. Jeon, J. H. Bae, S. Y. Lee, D. Chae, J-Y Chae, T. Paik, H. Lee, S. J. Oh
Summary: By utilizing CdSe/ZnS giant core-shell structures for wavelength conversion, efficient daytime radiative cooling can be achieved by transforming UV light into visible light, resolving absorption issues in reflective layers. The wavelength conversion-type radiative cooling emitter outperforms traditional products in cooling efficiency.
MATERIALS TODAY PHYSICS
(2021)
Article
Biochemical Research Methods
Olga A. Goryacheva, K. David Wegner, Aleksandr M. Sobolev, Ines Haeusler, Nikolai Gaponik, Irina Y. Goryacheva, Ute Resch-Genger
Summary: Light-emitting nanoparticles, known as quantum dots (QDs), have great potential for biosensing and bioimaging applications. However, their use in biological systems requires them to be water-dispersible without affecting their optical properties. In this study, researchers developed a new surface silanization method to preserve the optical properties of QDs and successfully prepared water-dispersible QDs.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Rachel M. Morin, Garnett W. Bryant, Elena Shevchenko, Yuchen Sha, Matthew Pelton
Summary: Characterizing the distribution of electron transfer rates from nanorods to molecules through individual measurements on CdSe/CdS core/shell nanorods functionalized with single methyl viologen molecules revealed that charge transfer most likely involves hot electrons in an excited conduction-band state. The ability to extract hot electrons from semiconductor nanocrystals may aid in energy-efficient photocatalysis, and the single-particle charge-transfer method could be a widely applicable tool to explore the spatial distribution of electronic states in nanocrystals.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Danja Fischli, Luisa Rieger, Klaus Boldt
Summary: Transition-metal-doped semiconductor nanocrystals have attracted interest in the field of spintronics. This paper presents a method for localized doping of CdSe/CdS dot-in-rods and investigates the interaction between dopants and excitons, as well as the kinetics of impurity diffusion.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Melissa Paulite, Krishna P. Acharya, Hue Minh Nguyen, Jennifer A. Hollingsworth, Han Htoon
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2015)
Article
Chemistry, Multidisciplinary
Krishna P. Acharya, Hue M. Nguyen, Melissa Paulite, Andrei Piryatinski, Jun Zhang, Joanna L. Casson, Hongwu Xu, Han Htoon, Jennifer A. Hollingsworth
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2015)
Review
Physics, Applied
Xuedan Ma, Han Htoon
MODERN PHYSICS LETTERS B
(2015)
Article
Chemistry, Multidisciplinary
Noah J. Orfield, James R. McBride, Feng Wang, Matthew R. Buck, Joseph D. Keene, Kemar R. Reid, Han Htoon, Jennifer A. Hollingsworth, Sandra J. Rosenthal
Article
Chemistry, Multidisciplinary
Nicolai F. Hartmann, Kirill A. Velizhanin, Erik H. Haroz, Mijin Kim, Xuedan Ma, YuHuang Wang, Han Htoon, Stephen K. Doorn
Article
Chemistry, Physical
Enzhi Xu, Zhen Li, Jaime Aviles Acosta, Nan Li, Brian Swartzentruber, ShiJian Zheng, Nikolai Sinitsyn, Han Htoon, Jian Wang, Shixiong Zhang
Article
Materials Science, Multidisciplinary
Hisato Yamaguchi, Shuichi Ogawa, Daiki Watanabe, Hideaki Hozumi, Yongqian Gao, Goki Eda, Cecilia Mattevi, Takeshi Fujita, Akitaka Yoshigoe, Shinji Ishizuka, Lyudmyla Adamska, Takatoshi Yamada, Andrew M. Dattelbaum, Gautam Gupta, Stephen K. Doorn, Kirill A. Velizhanin, Yuden Teraoka, Mingwei Chen, Han Htoon, Manish Chhowalla, Aditya D. Mohite, Yuji Takakuwa
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2016)
Article
Nanoscience & Nanotechnology
Siddharth Sampat, Tianle Guo, Kehao Zhang, Joshua A. Robinson, Yagnaseni Ghosh, Krishna P. Acharya, Han Htoon, Jennifer A. Hollingsworth, Yuri N. Gartstein, Anton V. Malko
Article
Nanoscience & Nanotechnology
Thomas Hartsfield, Michael Gegg, Ping-Hsiang Su, Matthew R. Buck, Jennifer A. Hollingsworth, Chih-Kang Shih, Marten Richter, Han Htoon, Xiaoqin Li
Article
Chemistry, Multidisciplinary
Christina J. Hanson, Nicolai F. Hartmann, Ajay Singh, Xuedan Ma, William J. I. DeBenedetti, Joanna L. Casson, John K. Grey, Yves J. Chabal, Anton V. Malko, Milan Sykora, Andrei Piryatinski, Han Htoon, Jennifer A. Hollingsworth
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2017)
Article
Optics
Xiaowei He, Nicolai F. Hartmann, Xuedan Ma, Younghee Kim, Rachelle Ihly, Jeffrey L. Blackburn, Weilu Gao, Junichiro Kono, Yohei Yomogida, Atsushi Hirano, Takeshi Tanaka, Hiromichi Kataura, Han Htoon, Stephen K. Doorn
Article
Physics, Multidisciplinary
Xuedan Ma, Sofie Cambre, Wim Wenseleers, Stephen K. Doorn, Han Htoon
PHYSICAL REVIEW LETTERS
(2017)
Article
Chemistry, Multidisciplinary
Akshit Peer, Zhongjian Hu, Ajay Singh, Jennifer A. Hollingsworth, Rana Biswas, Han Htoon
Article
Multidisciplinary Sciences
Nimai Mishra, Noah J. Orfield, Feng Wang, Zhongjian Hu, Sachidananda Krishnamurthy, Anton V. Malko, Joanna L. Casson, Han Htoon, Milan Sykora, Jennifer A. Hollingsworth
NATURE COMMUNICATIONS
(2017)
Article
Chemistry, Multidisciplinary
Xuedan Ma, Anthony R. James, Nicolai F. Hartmann, Jon K. Baldwin, Jason Dominguez, Michael B. Sinclair, Ting S. Luk, Omri Wolf, Sheng Liu, Stephen K. Doorn, Han Htoon, Igal Brener
Article
Chemistry, Multidisciplinary
Laetitia Bardet, Herve Roussel, Stefano Saroglia, Masoud Akbari, David Munoz-Rojas, Carmen Jimenez, Aurore Denneulin, Daniel Bellet
Summary: The thermal instability of silver nanowires leads to increased electrical resistance in AgNW networks. Understanding the relationship between structural and electrical properties of AgNW networks is crucial for their integration as transparent electrodes in flexible optoelectronics. In situ X-ray diffraction measurements were used to study the crystallographic evolution of Ag-specific Bragg peaks during thermal ramping, revealing differences in thermal and structural transitions between bare and SnO2-coated AgNW networks.
Article
Chemistry, Multidisciplinary
Nathalia Cancino-Fuentes, Arnau Manasanch, Joana Covelo, Alex Suarez-Perez, Enrique Fernandez, Stratis Matsoukis, Christoph Guger, Xavi Illa, Anton Guimera-Brunet, Maria V. Sanchez-Vives
Summary: This study provides a comprehensive characterization of graphene-based solution-gated field-effect transistors (gSGFETs) for brain recordings, highlighting their potential clinical applications.
Article
Chemistry, Multidisciplinary
Sikandar Aftab, Hailiang Liu, Dhanasekaran Vikraman, Sajjad Hussain, Jungwon Kang, Abdullah A. Al-Kahtani
Summary: This study examines the effects of hybrid nanoparticles made of NiO@rGO and NiO@CNT on the active layers of polymer solar cells and X-ray photodetectors. The findings show that these hybrid nanoparticles can enhance the charge carrier capacities and exciton dissociation properties of the active layers. Among the tested configurations, the NiO@CNT device demonstrates superior performance in converting sunlight into electricity, and achieves the best sensitivity for X-ray detection.
Article
Chemistry, Multidisciplinary
Hyo Jung Shin, Seung Gyu Choi, Fengrui Qu, Min-Hee Yi, Choong-Hyun Lee, Sang Ryong Kim, Hyeong-Geug Kim, Jaewon Beom, Yoonyoung Yi, Do Kyung Kim, Eun-Hye Joe, Hee-Jung Song, Yonghyun Kim, Dong Woon Kim
Summary: This study investigates the role of SOX9 in reactive astrocytes following ischemic brain damage using a PLGA nanoparticle plasmid delivery system. The results demonstrate that PLGA nanoparticles can reduce ischemia-induced neurological deficits and infarct volume, providing a potential opportunity for stroke treatment.
Article
Chemistry, Multidisciplinary
Anurag Chaudhury, Koushik Debnath, Nikhil R. Jana, Jaydeep K. Basu
Summary: The study investigates the interaction between nanoparticles and cell membranes, and identifies key parameters, including charge, crowding, and membrane fluidity, that determine the adsorbed concentration and unbinding transition of nanoparticles.
Article
Chemistry, Multidisciplinary
Sina Sadeghi, Fazel Bateni, Taekhoon Kim, Dae Yong Son, Jeffrey A. Bennett, Negin Orouji, Venkat S. Punati, Christine Stark, Teagan D. Cerra, Rami Awad, Fernando Delgado-Licona, Jinge Xu, Nikolai Mukhin, Hannah Dickerson, Kristofer G. Reyes, Milad Abolhasani
Summary: In this study, an autonomous approach for the development of lead-free metal halide perovskite nanocrystals is presented, which integrates a modular microfluidic platform with machine learning-assisted synthesis modeling. This approach enables rapid and optimized synthesis of copper-based lead-free nanocrystals.
Article
Chemistry, Multidisciplinary
Zahir Abbas, Nissar Hussain, Surender Kumar, Shaikh M. Mobin
Summary: The rational construction of free-standing and flexible electrodes for electrochemical energy storage devices is an emerging research focus. In this study, a redox-active metal-organic framework (MOF) was prepared on carbon nanofibers using an in situ approach, resulting in a flexible electrode with high redox-active behavior and unique properties such as high flexibility and lightweight. The prepared electrode showed excellent cyclic retention and rate capability in supercapacitor applications. Additionally, it could be used as a freestanding electrode in flexible devices at different bending angles.
Article
Chemistry, Multidisciplinary
Lishan Zhang, Xiaoting Zhang, Hui Ran, Ze Chen, Yicheng Ye, Jiamiao Jiang, Ziwei Hu, Miral Azechi, Fei Peng, Hao Tian, Zhili Xu, Yingfeng Tu
Summary: Photodynamic therapy (PDT) is a promising local treatment modality in cancer therapy, but its therapeutic efficacy is restricted by ineffective delivery of photosensitizers and tumor hypoxia. In this study, a phototactic Chlorella-based near-infrared (NIR) driven green affording-oxygen microrobot system was developed for enhanced PDT. The system exhibited desirable phototaxis and continuous oxygen generation, leading to the inhibition of tumor growth in mice. This study demonstrates the potential of using a light-driven green affording-oxygen microrobot to enhance photodynamic therapy.
Article
Chemistry, Multidisciplinary
Yujin Li, Jing Xu, Xinqi Luo, Futing Wang, Zhong Dong, Ke-Jing Huang, Chengjie Hu, Mengyi Hou, Ren Cai
Summary: In this study, hollow heterostructured materials were constructed using an innovative template-engaged method as cathodes for zinc-ion batteries. The materials exhibited fast Zn2+ transport channels, improved electrical conductivity, and controlled volume expansion during cycling. The designed structure allowed for an admirable reversible capacity and high coulombic efficiency.
Article
Chemistry, Multidisciplinary
Paritosh Mahato, Shashi Shekhar, Rahul Yadav, Saptarshi Mukherjee
Summary: This study comprehensively elucidates the role of the core and electrostatic surface of metal nanoclusters in catalytic reduction reactions. The electrostatic surface dramatically modulates the reactivity of metal nanoclusters.
Article
Chemistry, Multidisciplinary
Pei Liu, Mengdi Liang, Zhengwei Liu, Haiyu Long, Han Cheng, Jiahe Su, Zhongbiao Tan, Xuewen He, Min Sun, Xiangqian Li, Shuai He
Summary: This study demonstrates a simple and environmentally-friendly method for the synthesis of zinc oxide nanozymes (ZnO NZs) using wasted hop extract (WHE). The WHE-ZnO NZs exhibit exceptional peroxidase-like activity and serve as effective catalysts for the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H2O2). In addition, a straightforward colorimetric technique for detecting both H2O2 and glucose was developed using the WHE-ZnO NZs as peroxidase-like catalysts.
Article
Chemistry, Multidisciplinary
Hyunkyu Oh, Young Jun Lee, Eun Ji Kim, Jinseok Park, Hee-Eun Kim, Hyunsoo Lee, Hyunjoo Lee, Bumjoon J. Kim
Summary: Mesoporous carbon particles have unique structural properties that make them suitable as support materials for catalytic applications. This study investigates the impact of channel nanostructures on the catalytic activity of porous carbon particles (PCPs) by fabricating PCPs with controlled channel exposure on the carbon surface. The results show that PCPs with highly open channel nanostructures exhibit significantly higher catalytic activity compared to those with closed channel nanostructures.
Article
Chemistry, Multidisciplinary
Yunjie Lu, Zhaohui Li, Zewei Li, Shihao Zhou, Ning Zhang, Jianming Zhang, Lu Zong
Summary: A tough, long-lasting adhesive and highly conductive nanocomposite hydrogel (PACPH) was fabricated via the synergy of interfacial entanglement and adhesion group densification. PACPH possesses excellent mechanical properties, interfacial adhesion strength, and conductivity, making it a promising material for long-term monitoring of human activities and electrocardiogram signals.
Article
Chemistry, Multidisciplinary
Zichao Wei, Audrey Vandergriff, Chung-Hao Liu, Maham Liaqat, Mu-Ping Nieh, Yu Lei, Jie He
Summary: We have developed a simple method to prepare polymer-grafted plasmonic metal nanoparticles with pH-responsive surface-enhanced Raman scattering. By using pH-responsive polymers as ligands, the aggregation of nanoparticles can be controlled, leading to enhanced SERS. The pH-responsive polymer-grafted nanoparticles show high reproducibility and sensitivity in solution, providing a novel approach for SERS without the need for sample pre-concentration.
Article
Chemistry, Multidisciplinary
Melis Ozge Alas Colak, Ahmet Gungor, Merve Buldu Akturk, Emre Erdem, Rukan Genc
Summary: This research investigates the effect of functionalizing carbon dots with hydroxyl polymers on their performance as electrode materials in a supercapacitor. The results show that the functionalized carbon dots exhibit excellent electrochemical performance and improved stability.