In Situ Visualizing Oxidase-Mimicking Activity of Single MnOOH Nanotubes with Mie Scattering-Based Absorption Microscopy

Yu，Ling1; Li，Hua2; Huang，Wei1; Yu，Haili1; He，Yi1

2021

10.1021/acs.inorgchem.1c00250

INORGANIC CHEMISTRY   影响因子和分区

0020-1669

1520-510X

Imaging the catalytic activity at the single-particle level can greatly promote the screening and rational design of highly efficient nanozymes, but conventional techniques are based on ensemble analysis. Here, we present a new absorption microscopy for in situ visualizing oxidase-mimicking activity of single MnOOH nanotubes. The particle with a size more than 700 nm roughly equally scatters all wavelengths of visible light via Mie scattering, and the scattering light is collected by dark-field optical microscopy. When the particles absorb a single color of the scattering light, each individual nanoparticle shows its complementary color, enabling a form of absorption microscopy that we name Mie scattering-based absorption microscopy. We find that MnOOH nanotubes can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to generate polyTMB nanowires at their tips. There are multiple active sites on the surface of the individual nanotube, and the nanozyme activity shows a large heterogeneity as well as pH-dependent characteristic.

SCI ; EI

英语

NI期刊

其他

WOS:000637850300113

20211510185921

Brillouin scattering ; Catalyst activity ; Light ; Nanotubes ; Particle size analysis

Light/Optics:741.1 ; Nanotechnology:761 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Materials Science:951

CHEMISTRY

2-s2.0-85103627255

Scopus

1.National Collaborative Innovation Center for Nuclear Waste and Environmental Safety,School of National Defence Science and Technology,Southwest University of Science and Technology,Mianyang,621010,China
2.SUSTech Core Research Facilities,Southern University of Science and Technology,Shenzhen,518055,China

Yu，Ling,Li，Hua,Huang，Wei,et al. In Situ Visualizing Oxidase-Mimicking Activity of Single MnOOH Nanotubes with Mie Scattering-Based Absorption Microscopy[J]. INORGANIC CHEMISTRY,2021,60:5264-5270.

Yu，Ling,Li，Hua,Huang，Wei,Yu，Haili,&He，Yi.(2021).In Situ Visualizing Oxidase-Mimicking Activity of Single MnOOH Nanotubes with Mie Scattering-Based Absorption Microscopy.INORGANIC CHEMISTRY,60,5264-5270.

Yu，Ling,et al."In Situ Visualizing Oxidase-Mimicking Activity of Single MnOOH Nanotubes with Mie Scattering-Based Absorption Microscopy".INORGANIC CHEMISTRY 60(2021):5264-5270.