Year 2021 
Journal Info. Advanced Functional Materials, 31, 2105703 (2021) 
Author H. Dang, S. –G. Park, Y. Wu, N. Choi, J. –Y. Yang, S. Lee, S. –W. Joo*, L. Chen*, and J. Choo* 


Electromagnetic enhancement effects through localized surface plasmon resonance considerably amplify the intensity of incident light when molecules are positioned in the vicinity of miniscule nanogaps. The aggregation of plasmonic nanoparticles synthesized using bottom-up methods has been extensively used to generate hot spots in solutions. These methods assist in obtaining non-periodic plasmonic signals, because the realization of uniform nanogaps through particle aggregation is difficult. Nanostructured substrates with gaps of 20–100 nm have also been fabricated using the top-down approach. However, the fabrication of smaller nanogap templates using these methods is difficult owing to high costs and low throughput. Therefore, a nanodimple array internalized with AuNPs is developed in this study to mitigate the challenges encountered in the bottom-up and top-down approaches. Precise nanogaps are generated by regularly internalizing AuNPs in the cavities of nanodimples through DNA hybridization. Simulations of the electric field distribution indicate that the incorporation of 80 nm-sized AuNPs into a curved nanodimpled Au substrate generate high-density volumetric hot spots within a detection volume, and result in a high plasmonic enhancement factor of 8.25 × 107. The tremendous potential of the proposed plasmonic platform as an SERS-based biomedical diagnostic device is also verified.

Year Title Journal Info. etc.
2021  Reproducible and sensitive plasmonic sensing platforms based on Au-nanoparticle-internalized nanodimpled substrate file Advanced Functional Materials, 31, 2105703 (2021)   
2021  SERS-based serodiagnosis of acute febrile diseases using plasmonic nanopopcorn microarray platforms file Biosensors & Bioelectronics, 192, 113525 (2021)   
2021  Coumarin–lipoic acid conjugates on silver nanoparticle-supported nanopipettes for in situ dual-mode monitoring of intracellular Cu(II) and potential chemodynamic therapy applications file Sensors & Actuators B, 344, 130271 (2021)   
2021  SERS-based test strips: Principles, designs and applications file Biosensors & Bioelectronics, 189, 113360 (2021)   
2021  Sensitive detection of SARS-CoV-2 using SERS-based aptasensor file ACS Sensors, 6, 2378-2385 (2021)   
2021  SERS-based microfluidic devices for in vitro diagnostics In "Principles and Clinical Diagnostic Applications of
Surface-Enhanced Raman Spectroscopy" Book Chapter 7, Elsevier, in press. 
Book Chapter 
2021  SERS-based Dual-flow Lateral Flow Assay Sensor for the Ultrasensitive Detection of Thyroid-Stimulating Hormone file Analytical Chemistry, 93, 6673-6681 (2021)   
2021  Molecular Imprinting: Green Perspectives and Strategies file Advanced Materials, 33, 2100543 (2021)   
2021  Recent advances in sensitive surface-enhanced Raman scattering-based lateral flow assay platforms for point-of-care diagnostics of infectious diseases file Sensors & Actuators B, 329, 129214 (2021)  Invited Review 
2021  Determination of total iron-binding capacity of transferrin using metal organic framework-based surface-enhanced Raman scattering spectroscopy file J. Raman Spectrosc., 52, 506-515 (2021)  Invited Paper 
2021  A Wearable Surface-Enhanced Raman Scattering Sensor for Label-Free Molecular Detection file ACS Applied Materials & Interfaces, 13, 3024-3032 (2021)   
2020  Recent advances in surface-enhanced Raman scattering-based microdevices for point-of-care diagnosis of viruses and bacteria file Nanoscale, 12, 21560 (2020)  Invited Review 
2020  SERS imaging-based aptasensor for ultrasensitive and reproducible detection of influenza virus A file Biosensors & Bioelectronics, 167, 112496 (2020)   
2020  SERS-active Au@Ag core-shell nanorod (Au@AgNR) tags for ultrasensitive bacteria detection and antibiotic-susceptibility testing file Talanta, 220, 121397 (2020)   
2020  Improvement of reproducibility and thermal stability of surface-enhanced Raman scattering-based lateral flow assay strips using silica-encapsulated gold nanoparticles file Sensors & Actuators: B. Chemical, 321, 128521 (2020)   
2020  SERS biosensors for ultrasensitive detection of multiple biomarkers expressed in cancer cells file Biosensors & Bioelectronics, 164, 112326 (2020)   
2020  Integrated hand-powered centrifugation and paper-based diagnosis with blood-in/answer-out capabilities file Biosensors & Bioelectronics, 165, 112282 (2020)   
2020  Multi-emitting fluorescence sensor of MnO2-OPD-QDs for the multiplexed and visual detection of ascorbic acid and alkaline phosphatase file Journal of Materials Chemistry C, 8, 5554-5561 (2020)   
2020  Analysis of deoxyribonuclease activity by conjugation-free fluorescence polarization in sub-nanoliter droplets file Analyst, 145, 3222-3228 (2020)  Cover page 
2020  Present and Future of Surface-Enhanced Raman Scattering file ACS Nano, 14, 28-117 (2020)