Directly Convert Carbonaceous Microspheres to Three-Dimensional Porous Carbon Microspheres with a Robust Self-Supporting Structure as a Metal-Free SERS Substrate for Online High-Throughput Analysis

It is of great significance for practical applications to directly convert readily available biomass carbon into three-dimensional (3D) porous carbon microspheres with a self-supporting structure. Herein, we report the convenient conversion of biomass carbon microspheres to hierarchical porous carbo...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2022-10, Vol.94 (40), p.13659-13666
Main Authors: Zhang, Lu, Yin, Meng, Li, Junfang, Wei, Guoying, Bai, Hua, Xi, Guangcheng, Mao, Lanqun
Format: Article
Language:English
Subjects:
Analytical chemistry
Biomass
Carbon
Carbon - chemistry
Catalysis
Chemistry
Etching
Frame structures
Free surfaces
Microfluidics
Microspheres
Porosity
Raman spectra
Robustness
Silicon dioxide
Silicon Dioxide - chemistry
Silver - chemistry
Spectrum Analysis, Raman - methods
Substrates
Surface stability
Thermal stability
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Summary:It is of great significance for practical applications to directly convert readily available biomass carbon into three-dimensional (3D) porous carbon microspheres with a self-supporting structure. Herein, we report the convenient conversion of biomass carbon microspheres to hierarchical porous carbon microspheres (HP-CMSs) with a robust self-supporting framework structure. A general SiO2-induced etching mechanism is proposed for the formation of the HP-CMSs. Benefiting from this robust 3D self-supporting frame structure, these HP-CMSs have outstanding mechanical, chemical, and thermal stability. As a metal-free surface-enhanced Raman scattering (SERS) substrate with an ultrahigh specific surface area (4216 m2 g–1) and a high density of active sites, the HP-CMSs exhibit high sensitivity with a detection limit of 10–10 M and a Raman enhancement factor of 3.5 × 106. By integrating the enrichment and sensing functions of the HP-CMSs in a microfluidic channel, online high-throughput SERS detection of 20 samples within 5 min is achieved in a single channel, and the relative standard deviation of the signals between samples is only 5.1%. The current work develops a convenient preparation method that converts sustainable biomass carbon to 3D hierarchical porous carbon and provides a potential material for sensing, energy, catalysis, and other fields.
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.2c00757