Search

Your search keyword '"Peng, Yu"' showing total 314 results
Start Over Author "Peng, Yu" Publisher american chemical society
314 results on '"Peng, Yu"'

5. Boosting Monolayer Transition Metal Dichalcogenides Growth by Hydrogen-Free Ramping during Chemical Vapor Deposition

Author

Liu, Hongwei, Zhang, Tianyi, Wu, Peng, Lee, Hae Won, Liu, Zhenjing, Tang, Tsz Wing, Tang, Shin-Yi, Kang, Ting, Park, Ji-Hoon, Wang, Jun, Zhang, Kenan, Zheng, Xudong, Peng, Yu-Ren, Chueh, Yu-Lun, Liu, Yuan, Palacios, Tomás, Kong, Jing, Luo, Zhengtang, Liu, Hongwei, Zhang, Tianyi, Wu, Peng, Lee, Hae Won, Liu, Zhenjing, Tang, Tsz Wing, Tang, Shin-Yi, Kang, Ting, Park, Ji-Hoon, Wang, Jun, Zhang, Kenan, Zheng, Xudong, Peng, Yu-Ren, Chueh, Yu-Lun, Liu, Yuan, Palacios, Tomás, Kong, Jing, and Luo, Zhengtang

Abstract

The controlled vapor-phase synthesis of two-dimensional (2D) transition metal dichalcogenides (TMDs) is essential for functional applications. While chemical vapor deposition (CVD) techniques have been successful for transition metal sulfides, extending these methods to selenides and tellurides often faces challenges due to uncertain roles of hydrogen (H-2) in their synthesis. Using CVD growth of MoSe2 as an example, this study illustrates the role of a H-2-free environment during temperature ramping in suppressing the reduction of MoO3, which promotes effective vaporization and selenization of the Mo precursor to form MoSe2 monolayers with excellent crystal quality. As-synthesized MoSe2 monolayer-based field-effect transistors show excellent carrier mobility of up to 20.9 cm(2)/(Vs) with an on-off ratio of 7 x 10(7). This approach can be extended to other TMDs, such as WSe2, MoTe2, and MoSe2/WSe2 in-plane heterostructures. Our work provides a rational and facile approach to reproducibly synthesize high-quality TMD monolayers, facilitating their translation from laboratory to manufacturing.

Published
2024

26. Spectroscopic and Theoretical Investigation of β‑Lactoglobulin Interactions with Hematoporphyrin and Protoporphyrin IX

Author

Jin Chen, Zhuo Huang, Yuan-Nong Ye, Zuquan Hu, Peng Yu, Simian Zhu, Fuzhou Tang, Min Gong, Zhu Zeng, Hai Min, and Yun Wang

Subjects
chemistry.chemical_classification, Hematoporphyrin, Protoporphyrin IX, General Chemical Engineering, medicine.medical_treatment, Complex formation, Nanoparticle, Photodynamic therapy, General Chemistry, Porphyrin, Article, chemistry.chemical_compound, Chemistry, chemistry, medicine, Biophysics, Non-covalent interactions, Binding site, QD1-999
Abstract

Hematoporphyrin (HP) and protoporphyrin IX (PPIX) are useful porphyrin photosensitizers with significant application values in photodynamic therapy. Currently, many strategies have been developed to improve their clinical performance, such as incorporating them with nanoparticle (NP) carriers. In this work, we studied the possibility of using β-lactoglobulin (BLG) as a potential NP carrier due to their hydrophobic affinity, pH sensitivity, and low cost of extraction and preservation. The interaction mechanisms of BLG with HP and PPIX were investigated using spectroscopic techniques and molecular docking methods. The molecular docking results agree well with the experimental results, which demonstrate that the formations of HP-BLG and PPIX-BLG complexes are endothermic processes and the main acting force is hydrophobic force. Furthermore, the opening-closure states of EF loop have a great influence on the HP-BLG complex formation, where the central hydrophobic cavity of β-barrel is available for HP binding at pH 7.4 but not available at pH 6.2. However, the formation of the PPIX-BLG complex is less dependent on the states of the EF loop, and the binding sites of PPIX are both located on the external surface of BLG under both pH 7.4 and 6.2 conditions. All of our results would provide new insight into the mechanisms of noncovalent interactions between BLG and HP/PPIX. It is believed that this work indicated the potential application values of BLG in designing pH-sensitive carriers for the delivery of HP and PPIX, as well as other poorly soluble drugs.

Published
2021

45. [IIA.sup.Glc] inhibition of glycerol kinase: A communications network tunes protein motions at the allosteric site

Author

Peng Yu, Lasagna, Mauricio, Pawlyk, Aaron C., Reinhart, Gregory D., and Pettigrew, Donald W.

Subjects
Escherichia coli -- Research, Hemophilus infections -- Prevention, Cysteine -- Research, Biological sciences, Chemistry
Abstract

Variants of Escherichia coli glycerol kinase and the chimeric, allosteric Haemophilus influenzae glycerol kinase were constructed with a non-native cysteine residue replacing one of the native residues in the [IIA.sup.Glc] binding site. It is indicated that the motions of the fluorokphore reflect backbone motions of the [IIA.sup.Glc] binding site.

Published
2007

Catalog

Books, media, physical & digital resources
See catalog results