Article
Chemistry, Analytical
Chingche Chen, Xin-Ping Peng, Shuehlin Yau
Summary: In this study, in situ scanning tunneling microscopy was used to examine the adsorption behavior of terthiophene on an Au(111) electrode and to investigate the effects of potential control on anion coadsorption and thiophene oxidation. The results showed that TT had different adsorption modes and oxidation characteristics in sulfuric acid and perchloric acid solutions.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Chaoqin Huang, Lei Xie, Hongbing Wang, Wei Sun, Zhaofeng Liang, Zheng Jiang, Fei Song
Summary: In this study, the adsorption effect of CO on VSe2 was systematically investigated using in-situ scanning tunneling microscopy and density functional theory calculations. At low CO pressure, a few adsorbed CO molecules cause the desorption of top-Se atoms and the formation of point defects. As the pressure increases, the adsorbed CO amount and the desorption of underlying V atoms increase, leading to the structural transition of the entire VSe2. It is worth noting that CO atmosphere was continuously injected during the experiment, and some dynamic behavior of CO adsorption on VSe2 was captured in the STM images, which is rarely observed in other static systems like UHV-STM.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Shunsuke Okada, Yosuke Matsumoto, Rikana Takahashi, Kenta Arai, Shingo Kanemura, Masaki Okumura, Takahiro Muraoka
Summary: We developed a synthetic thiol-based compound, pyridinylmethanethiol, that can promote oxidative protein folding with high efficiency. The N-methylation of pyridinylmethanethiol increased its acidity and oxidizability, enhancing the folding promotion efficiencies. Among the isomers, para-substituted N-methylated pyridinylmethanethiol showed the highest efficiency in promoting oxidative protein folding. This study provides insights for the design of synthetic biofunctional agents effective for the promotion of oxidative protein folding.
Article
Nanoscience & Nanotechnology
Lesia Piliai, Peter Matvija, Thu Ngan Dinhova, Ivan Khalakhan, Tomas Skala, Zdenek Dolezal, Oleksii Bezkrovnyi, Leszek Kepinski, Mykhailo Vorokhta, Iva Matolinova
Summary: In this study, the metal-substrate interaction and species transformation during CO oxidation on CeO2(111) surface were investigated. It was found that the interaction between gold nanoparticles and peroxo oxygen species formed on ceria step edges resulted in the formation of ionic gold species. Moreover, the addition of O2 led to the rapid growth of Au particles and the formation of large particles.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Analytical
Yu -Chun Hsiao, Arulmozhi Velusamy, Shakil N. Afraj, Jia-Hao Liu, Cheng-Liang Liu, Ming-Chou Chen, Hsien-Ming Kao, Shuehlin Yau
Summary: The adsorption of 3',4'-bis(hexylthio)-2,2':5',2''-terthiophene (DTDST) on an ordered Au(1 1 1) electrode was studied using STM. The organization of DTDST on the electrode was greatly influenced by the applied potential. The adsorbed DTDST molecules could undergo oxidation to form oligomers.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Manuel Meusel, Afra Gezmis, Simon Jaekel, Matthias Lexow, Andreas Bayer, Florian Maier, Hans-Peter Steinrueck
Summary: The study investigates the morphology and wetting behavior of [C(1)C(1)Im][Tf2N] deposited on Au(111) at different temperatures, revealing different growth behaviors between deposition at room temperature and deposition below 170 K followed by slow annealing to room temperature. The formation of 2-30 nm high metastable 3D droplets on a checkerboard-type wetting layer is observed upon deposition at room temperature, which eventually spread out into stable 2D bilayers. Tip effects and X-ray radiation are found to accelerate the transformation process from 3D droplets to 2D bilayer islands.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Biochemistry & Molecular Biology
Pawel Krukowski, Takuma Hattori, Megumi Akai-Kasaya, Akira Saito, Hideji Osuga, Yuji Kuwahara
Summary: The light emission properties of helicene molecules on Au(111) surfaces were investigated using tunneling-current-induced light-emission technique. Plasmon-originated light emission was observed on the helicene/Au(111) surface, but suppressed at the edges of the Au(111) terraces where the molecules were adsorbed. To overcome this, C-60 layers were used as decoupling buffer layers. The multilayers of helicene molecules on C-60 showed strong luminescence modulated by the molecular electronic states.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Nanoscience & Nanotechnology
Jason Wang, Yilin Ma, Mausumi Mahapatra, Jindong Kang, Sanjaya D. Senanayake, Xiao Tong, Dario J. Stacchiola, Michael G. White
Summary: The study investigated the structures formed by mass-selected niobium oxide clusters deposited on Au(111) using scanning tunneling microscopy. It was found that the assembly sizes and heights of the clusters change upon annealing, with differences attributed to variations in metal-oxygen stoichiometry affecting cluster binding energies, mobility, and interactions.
Article
Chemistry, Multidisciplinary
Mingjun Zhong, Qimeng Wu, Liang Ma, Jie Li, Yifan Wang, Yansong Wang, Xin Li, Yajie Zhang, Jingtao Lue, Yongfeng Wang
Summary: In this study, Fe-tetraphenyl porphyrin (FeTPP) was synthesized on the surface and characterized using low-temperature scanning tunneling microscopy and spectroscopy. The research revealed that FeTPP exhibits robust magnetic properties on metallic substrates and undergoes structural distortion upon adsorption. The spin distribution of FeTPP and the electron transport mechanism were investigated through density functional theory calculations.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Physical
Juan M. Lombardi, Doris Grumelli, Rico Gutzler, H. Fabio Busnengo, Paula Abufager
Summary: We used density functional theory (DFT) calculations to analyze the properties of FeTPyP self-assembled monolayers (SAMs) and FeTPyP+Fec metal-organic coordination networks (MOCNs) on Au(111). The relative importance of multiple competing interactions that determine the optimum structure and stability of both networks was determined through a rigorous step-by-step approach. In the FeTPyP/Au(111) SAMs, we observed a complex energy landscape, with molecules preferring molecule-molecule distances around 13.7 and 14.3 angstrom. Molecule-surface interactions were more prominent in less dense packing (around 14.3 angstrom), while intermolecular interactions favored the compact structure (around 13.7 angstrom). In the FeTPyP-Fec/Au(111) MOCN, the strong Fec-Npy bond between the peripheral iron atom Fec and nitrogen atoms of neighboring pyridyl groups (Npy) was found to drive the network development, with the preferred molecule-molecule distance remaining at around 13.7 angstrom. These findings highlight the necessity of theoretical treatments that consider all relevant interactions to adequately describe surface-supported SAMs and MOCNs.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Umamahesh Thupakula, Priya Laha, Gertjan Lippertz, Koen Schouteden, Asteriona-Maria Netsou, Aleksandr Seliverstov, Herman Terryn, Lino M. C. Pereira, Chris Van Haesendonck
Summary: Two-dimensional allotropes of tellurium, known as tellurene, have recently attracted attention in materials research due to their exotic properties in ultrathin form. This study reports the observation of three different 2D superstructures of tellurene on Au(111) surfaces using an alternative experimental deposition approach. The superstructures were characterized using scanning tunneling microscopy and spectroscopy, Auger electron spectroscopy, and field emission AES. The study found that the formation of these superstructures led to changes in the surface reconstruction of Au(111), and the electronic properties of the tellurium atoms showed a strong dependence on their structural arrangement. The emergence of band gaps with a p-type charge character was observed in two of the superstructures on Au(111).
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Multidisciplinary Sciences
Pai Li, Feng Ding
Summary: In this study, a machine learning force field was trained to explore the atomic-level explanation of herringbone reconstruction on the Au(111) surface. It was found that the lattice deformation in deeper layers of Au plays a critical role in the herringbone reconstruction, and the herringbone reconstruction is energetically favored over stripe reconstruction when the slab thickness exceeds 12 atomic layers. Additionally, the study revealed the high stability of herringbone reconstruction at high temperatures, and a slight strain can induce a transition from herringbone to stripe pattern, consistent with experimental observations.
Article
Chemistry, Physical
Corinna Stumm, Sebastian Grau, Florian D. Speck, Felix Hilpert, Valentin Briega-Martos, Karl Mayrhofer, Serhiy Cherevko, Olaf Brummel, Joerg Libuda
Summary: This study investigates the oxidation and subsequent reduction processes of Au(111) electrodes in an acidic electrolyte, finding that the reduction rate influences the formation of holes on the surface. Slow reduction leads to larger atomic holes and dissolved Au species in the electrolyte, while fast reduction results in smaller holes and additional two-dimensional Au islands, with almost no dissolved Au detected. These differences are attributed to competing processes of dissolved Au diffusion and direct renucleation during reduction.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Coatings & Films
Kennedy P. S. Boyd, Emily A. Cook, Maria A. Paszkowiak, Erin V. Iski
Summary: The study showed that the presence of an Ag monolayer can drastically alter the interactions between amino acids and surfaces, leading to surface roughening despite the chemical similarity of Au and Ag. This research highlights the ability of Ag thin films to markedly change surface chemistry under extremely mild conditions.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2021)
Article
Nanoscience & Nanotechnology
R. A. Rehman, H. J. Zhang, A. Razaq, S. M. Ramay, M. Hasan, M. A. Javed, S. Atiq
Summary: Co-phthalocyanine molecules exhibit diverse adsorption behaviors on Au(111) surface, as investigated by UPS, AR-UPS, and STM techniques. The results reveal that the adsorption of CoPc molecules varies with coverage and temperature, indicating a strong interaction at the CoPc-Au(111) interface.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Chemistry, Physical
Jun Wang, Si-Dong Zhang, Si-Jie Guo, Si-Qi Lu, Yan-Song Xu, Jin-Yang Li, An -Min Cao, Li-Jun Wan
Summary: A surface coating strategy using manganese oxide nanoshell to protect the 4.5 V LCO cathode has been developed, resulting in improved stability and cycling performance.
Article
Chemistry, Physical
Lili Fan, Xiaofei Wei, Xuting Li, Zhanning Liu, Mengfei Li, Shuo Liu, Zixi Kang, Fangna Dai, Xiaoqing Lu, Daofeng Sun
Summary: This study reports a phosphorus-doped catalyst FeNPC with penta-coordinated single atom sites for efficient oxygen reduction reaction (ORR). The electronic distribution and adsorption strength of Fe-N-4 can be adjusted, reducing the reaction free energy of the potential-limiting step. Electrochemical tests show that FeNPC exhibits remarkable ORR activity and stability in alkaline, neutral, and acidic media.
Article
Plant Sciences
Xianming Zhou, Haiyan Zhang, Zhaoqi Xie, Ying Liu, Pengfei Wang, Lihong Dai, Xiaohui Zhang, Zhaoyang Wang, Zhuanrong Wang, Lili Wan, Guangsheng Yang, Dengfeng Hong
Summary: This study revealed the core function of BnaC2.MYB28 in regulating seed glucosinolate content in rapeseed and proposed a promising strategy for manipulating it.
Article
Chemistry, Multidisciplinary
Ya-Chen Feng, Xiang Wang, Zhen-Yu Yi, Yu-Qi Wang, Hui-Juan Yan, Dong Wang
Summary: We used ECSTM to investigate the in-situ production of H2O2 in the CoTMPP-catalyzed ORR in neutral electrolytes. STM images showed the adsorption of 00H on active sites, which was found to be correlated with the pH value of the electrolyte. The thermodynamic parameters of the formation of CoTMPP-OOH- complex were extracted from the quantitative analysis of the STM images. The in-situ ECSTM experiments identified the formation and transformation process of H2O2 at the molecular scale, providing direct evidence for the rational design of high-efficiency electrocatalysts.
SCIENCE CHINA-CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Qing Hao, Xiao-Rui Ren, Yichen Chen, Chao Zhao, Jingyi Xu, Dong Wang, Hong Liu
Summary: Covalent organic frameworks are increasingly being used in the design of stimuli-responsive materials. In this study, a sweat-responsive covalent organic framework film was designed for material-based fingerprint liveness detection. The color change induced by sweat can intuitively distinguish living fingers from fake fingerprints. Additionally, the collection and analysis of sweat pore distribution can be achieved by simplifying the sample handling steps.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Mingchao Shao, Qingsong Zhang, Xiaofang Wei, Jinyang Chen, Wenqiang Gao, Guocai Liu, Junhua Kuang, Yangshuang Bian, Chengyu Wang, Yanwei Liu, Mingcong Qin, Jiling Yue, Dong Wang, Yunqi Liu, Yunlong Guo
Summary: A twisted node modulation strategy is proposed to address the challenges of controlled interlayer stacking, solvent processing, and long-afterglow luminescence in two-dimensional covalent organic frameworks (2D-COFs). By introducing twisted and non-twisted nodes alternately, a reversible crystal transformation is achieved between eclipsed and inclined stacking. The inclined COFs can be easily exfoliated into nanosheets for solution processing. Programmatic long-afterglow luminescence is achieved by confining isolated exfoliated nanosheets within polymethyl methacrylate for various functional applications.
CELL REPORTS PHYSICAL SCIENCE
(2023)
Article
Chemistry, Physical
Yu-Qi Wang, Xiao-Han Dan, Zhen-Yu Yi, Xiang Wang, Ya-Chen Feng, Yue Feng, Dong Wang, Li-Jun Wan
Summary: This study investigates the O-2 adsorption and reduction on cobalt porphyrin (CoOEP) and phthalocyanine (CoPc) using in situ electrochemical scanning tunneling microscopy (ECSTM). Results show higher ORR activity of CoOEP compared to CoPc. Molecular-level imaging reveals that O-2 adsorbs mainly on Co-II sites and exhibits higher contrast in ECSTM images on CoOEP compared to CoPc. The dynamics of O-2 adsorption are quantitatively measured, with CoOEP exhibiting higher binding dynamics and lower Co-O dissociation barriers compared to CoPc.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Xiang Wang, Zhen-Yu Yi, Yu-Qi Wang, Dong Wang, Li-Jun Wan
Summary: This study investigated the dynamic processes of methanol absorption and catalytic conversion on isolated single-atom Rh-N-4 sites using in situ electrochemical scanning tunneling microscopy. The results provided microscopic insights into the catalytic mechanism and reaction dynamics of methanol electrooxidation on Rh-N-4 sites, which is valuable for the rational design of high-performance catalysts.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Shu-Ying Li, Ting Chen, Qi Chen, Dong Wang, Guangshan Zhu
Summary: This study combines the majority-rules principle and concentration-dependent molecular assembly at the liquid/solid interface to achieve homochirality. A lower molecular concentration facilitates more efficient amplification of chirality.
Article
Chemistry, Physical
Yu-Qi Wang, Xiao-Han Dan, Zhen-Yu Yi, Xiang Wang, Ya-Chen Feng, Yue Feng, Dong Wang, Li-Jun Wan
Summary: The in situ electrochemical scanning tunneling microscopy (ECSTM) study of O2 adsorption and reduction on cobalt porphyrin (CoOEP) and phthalocyanine (CoPc) is reported. CoOEP exhibits higher ORR activity than CoPc according to electrochemical measurements. Self-assembled CoOEP and CoPc monolayers on Au(111) substrates are observed at molecular resolution by ECSTM. O2 adsorbs on CoII sites and has high contrast in ECSTM images for both CoOEP-O2 and CoPc-O2 complexes. The surface coverage of CoOEP-O2 is approximately 1.4 times higher than that of CoPc-O2. The dynamics of O2 adsorption, quantitatively measured by potential step experiments, indicate higher dynamics and lower barriers for Co-O dissociation on CoOEP compared to CoPc.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Review
Chemistry, Multidisciplinary
Ya-Chen Feng, Xiang Wang, Dong Wang
Summary: This review summarizes the applications of metal porphyrins and metal phthalocyanines as model catalysts in electrocatalytic reactions, providing important insights into understanding the catalytic mechanism and structure-activity relationship.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
Lili Fan, Xiaofei Wei, Xuting Li, Zhanning Liu, Mengfei Li, Shuo Liu, Zixi Kang, Fangna Dai, Xiaoqing Lu, Daofeng Sun
Summary: This study reports a phosphorus-doped Fe-N-C catalyst with penta-coordinated single atom sites for efficient oxygen reduction. The catalyst exhibits remarkable ORR activity and stability in alkaline, neutral, and acidic media.
