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Suppression of coffee-ring effect: Via periodic oscillation of substrate for ultra-sensitive enrichment towards surface-enhanced Raman scattering
Ji,Bing1; Zhang,Lingjun2; Li,Mingzhong3; Wang,Shuangpeng1,4; Law,Man Kay3; Huang,Yingzhou2; Wen,Weijia5; Zhou,Bingpu1,4
2019-11-21
Source PublicationNanoscale
ISSN2040-3364
Volume11Issue:43Pages:20534-20545
AbstractSurface-enhanced Raman scattering (SERS) has attracted extensive interest due to excellent molecule recognition and sensitive concentration detection. Nevertheless, the coffee ring effect (CR) during the analyte evaporation always causes an uneven distribution of the assembled hot-spots, and hence the unreliable SERS signal is produced. In this study, for the first time, we present a suppressed coffee ring (SCR) system via a combination of a magnetically functionalized membrane and reciprocating magnetic field to dynamically suppress the CR for highly reliable and ultra-sensitive SERS detection. The enrichment mechanism of the nanoparticles and the analyte molecules within the sessile droplet based on the proposed system was studied. We experimentally observed that the driving frequency could well affect the final pattern, and typically a higher driving frequency facilitated a smaller coverage area with better enrichment performance. With the use of R6G molecule and (100 nm) gold nanoparticles, we examined the uniformity and SERS of the assembled 'hot-spots' in the SCR system. The results indicate that the uniformity can be greatly improved via SCR in comparison of ring stain, with the RSD of a Raman signal as low as 7.1% even at a low concentration of 10 mol L. Such system also enables the further enhancement in the SERS signal, with the detection limit down to 10 mol L, the enhancement factor magnitude up to 10, and the linear relationship between the SERS intensity and the analyte concentrations within the range of 10-10 and 10-10 mol L, respectively. The applicability of the SCR-based SERS detection for diverse analytes was also proved with a similar but further enhanced signal of MB and 4-ATP. We believe that the excellent SCR-based SERS performance via the proposed system has great potentials for ultra-sensitive detection and/or precise quantitative analysis in various research fields and applications.
DOI10.1039/c9nr06989e
URLView the original
Language英语
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Cited Times [WOS]:7   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorZhou,Bingpu
Affiliation1.Joint Key Laboratory of the Ministry of Education,Institute of Applied Physics and Materials Engineering,University of Macau,Taipa,Avenida da Universidade,Macao
2.Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials,College of Physics,Chongqing University,Chongqing,400044,China
3.State Key Laboratory of Analog and Mixed-Signal VLSI,University of Macau,China,Macao
4.Department of Physics and Chemistry,Faculty of Science and Technology,University of Macau,Taipa,Avenida da Universidade,Macao
5.Department of Physics,Hong Kong University of Science and Technology,Kowloon,Clear Water Bay,Hong Kong
First Author AffilicationINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Corresponding Author AffilicationINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING;  Faculty of Science and Technology
Recommended Citation
GB/T 7714
Ji,Bing,Zhang,Lingjun,Li,Mingzhong,et al. Suppression of coffee-ring effect: Via periodic oscillation of substrate for ultra-sensitive enrichment towards surface-enhanced Raman scattering[J]. Nanoscale,2019,11(43):20534-20545.
APA Ji,Bing,Zhang,Lingjun,Li,Mingzhong,Wang,Shuangpeng,Law,Man Kay,Huang,Yingzhou,Wen,Weijia,&Zhou,Bingpu.(2019).Suppression of coffee-ring effect: Via periodic oscillation of substrate for ultra-sensitive enrichment towards surface-enhanced Raman scattering.Nanoscale,11(43),20534-20545.
MLA Ji,Bing,et al."Suppression of coffee-ring effect: Via periodic oscillation of substrate for ultra-sensitive enrichment towards surface-enhanced Raman scattering".Nanoscale 11.43(2019):20534-20545.
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