Strain Effect in Palladium Nanostructures as Nanozymes

Journal Article · Tue Dec 10 00:00:00 EST 2019 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.9b03782· OSTI ID:1594049

Xi, Zheng ^[1]; Cheng, Xun ^[2]; Gao, Zhuangqiang ^[3]; Wang, Mengjing ^[3]; Cai, Tong ^[4]; Muzzio, Michelle ^[4]; Davidson, Edwin ^[3]; Chen, Ou ^[4]; Jung, Yeonwoong ^[3]; Sun, Shouheng ^[4]; Xu, Ye ^[2]; Xia, Xiaohu ^[3]

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1. Univ. of Central Florida, Orlando, FL (United States); Louisiana State University
2. Louisiana State Univ., Baton Rouge, LA (United States)
3. Univ. of Central Florida, Orlando, FL (United States)
4. Brown Univ., Providence, RI (United States)

While various effects of physicochemical parameters (e.g., size, facet, composition, and internal structure) on the catalytic efficiency of nanozymes (i.e., nanoscale enzyme mimics) have been studied, the strain effect has never been reported and understood before. Herein, we demonstrate the strain effect in nanozymes by using Pd octahedra and icosahedra with peroxidase-like activities as a model system. Strained Pd icosahedra were found to display 2-fold higher peroxidase-like catalytic efficiency than unstrained Pd octahedra. Theoretical analysis suggests that tensile strain is more beneficial to OH radical (a key intermediate for the catalysis) generation than compressive strain. Pd icosahedra are more active than Pd octahedra because icosahedra amplify the surface strain field. As a proof-of-concept demonstration, the strained Pd icosahedra were applied to immunoassay of biomarkers, outperforming both unstrained Pd octahedra and natural peroxidases. The findings in this research may serve as a strong foundation to guide the design of high-performance nanozymes.

• Research Organization: Louisiana State Univ., Baton Rouge, LA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: SC0018408
• OSTI ID: 1594049
• Alternate ID(s): OSTI ID: 1656777
• Journal Information: Nano Letters, Journal Name: Nano Letters Journal Issue: 1 Vol. 20; ISSN 1530-6984
• Publisher: American Chemical Society
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Palladium nanostructures
catalysis
enzyme mimic
immunoassay
strain effect