Article
Chemistry, Multidisciplinary
Zhi-Jun Zhao, Junseong Ahn, Soon Hyoung Hwang, Jiwoo Ko, Yongrok Jeong, Moonjeong Bok, Hyeok-Joong Kang, Jungrak Choi, Sohee Jeon, Inkyu Park, Jun-Ho Jeong
Summary: A simple method proposed in this study allows for the fabrication of large-area, ultra-small nanogaps on a flexible substrate, with the ability to easily control the gap size and produce 3D multilayer nanostructures and nanocomposites without the need for post-treatment. This method offers a fast, simple, and cost-effective approach to nanofabrication with potential applications in flexible electronics and soft actuators.
Article
Chemistry, Analytical
Xiurui Ke, Jinran Chen, Lin Chang, Zhou Zhou, Wei Zhang
Summary: A new method for preparing a SERS substrate with excellent SERS activity by combining self-assembly techniques and flexible materials was reported in this paper. The PDMS-Ag substrate exhibited an enhancement factor (EF) of 2.90 x 10(9) and a detection limit (LOD) of 10(-11) M for ATP. It also achieved quantitative analysis of PNP with a LOD of 10(-8) M, showing high sensitivity and reproducibility.
ANALYTICAL METHODS
(2023)
Article
Chemistry, Analytical
Xiurui Ke, Jinran Chen, Lin Chang, Zhou Zhou, Wei Zhang
Summary: This study reports a new method to prepare a SERS substrate with excellent SERS activity by combining self-assembly techniques and flexible materials. The PDMS-Ag substrate exhibits high sensitivity and reproducibility, and it can detect PNP in trace amounts, with a LOD of 10(-8) M. The PDMS-Ag substrate has great potential for detecting other contaminants.
ANALYTICAL METHODS
(2023)
Article
Chemistry, Analytical
Tingting Zhang, Xiaoli Xin, Anqi Li, Tao Xu, Luo Li, Chang Liu, Weihua Li, Jiansheng Li, Yi Li, Rui Lu
Summary: The study focused on utilizing carbon-coated Ag@C@C8 nanoparticles prepared via a one-step hydrothermal synthesis method for surface enhancement Raman scattering (SERS). The nanoparticles exhibited high sensitivity, good uniformity, and long stability, demonstrating successful application in detecting and analyzing Raman signals.
Article
Chemistry, Analytical
Shaoyun Chen, Long Chen, Yu Zhang, Dong Xu, Chenglong Hu, Long Zhang, Jian Chen
Summary: Here, we report a facile method to control the nanogap distance of silver nanosheets for high sensitive plasmonic surface-enhanced Raman scattering (SERS) substrates. By adjusting the diameter of sulfonated polystyrene (SPS) microspheres, the nanogap distance of self-assembled Ag nanosheets on SPS microspheres could be controlled, enabling high sensitive detection of analytes. The prepared substrate offers promising opportunities for practical applications of SERS.
Article
Chemistry, Multidisciplinary
Jian-Wun Huang, Yu-Min Kao, Po-Wei Chiu, Tso-Hsiang Wu, Yeeu-Chang Lee
Summary: This study utilized colloidal lithography and imprint lithography to create a light diffusion film based on surface microstructure. By arranging PS spheres of various diameters, it was found that a double layer of spheres showed the best optical diffusion performance.
JOURNAL OF NANOPARTICLE RESEARCH
(2021)
Article
Biophysics
Seung Jun Lee, Hyeyeon Lee, Talshyn Begildayeva, Yiseul Yu, Jayaraman Theerthagiri, Yonghyeon Kim, Young Wook Lee, Sang Woo Han, Myong Yong Choi
Summary: Gold nanoparticles (Au NPs) were synthesized by pulsed laser ablation (PLA) in a mixed-phase solvent, and the surface-enhanced Raman scattering (SERS) activity was strongly dependent on the nanogaps between particles. Controlling the nanogaps by changing the amount of graphitic carbon (GC) layers resulted in significant SERS enhancement in Au NPs prepared in 30% acetonitrile.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Tangyou Sun, Furong Shui, Taohua Ning, Wenjing Guo, Zhiping Zhou, Zanhui Chen, Cheng Qian, Qian Li
Summary: Nanostructure engineering is one of the most effective strategies to improve photoelectric device efficiency. In this study, we investigated and demonstrated a self-assembled silicon-based nanopillars and nanoholes structure, which enhanced light absorption by reducing reflection. The experimental results showed a significant reduction in reflectivity, indicating the potential of self-assembled nanopillars and nanoholes structures to improve photoelectric device efficiency.
Article
Chemistry, Physical
Kuanguo Li, Xiangyu Tang, Guangju Liu, Jiajia Mi, Jing Du, Wanxia Huang, Zewen Zuo, Yonghua Lu
Summary: The research team proposed an efficient fabrication strategy to construct large-area and highly ordered 3D silver urchin-like nanostructures, which exhibit superior performance in SERS analysis and have promising applications.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Jong-Guk Ahn, Gyeonghun Yeo, Yeji Han, Younghee Park, Jong Wook Hong, Hyunseob Lim
Summary: Using an atomically thin hexagonal boron nitride (h-BN) shielding layer between Au nanoparticles and Au substrates can prevent electrical shorts, improving the sensitivity of Raman detection.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Spectroscopy
Rahul Joshi, Samir Adhikari, Jong Pil Son, Yudong Jang, Donghan Lee, Byong-Kwan Cho
Summary: Conventional spectroscopic methods such as IR and Raman lack effectiveness in detecting low levels of pesticides or harmful chemicals in food. This study presents a highly sensitive and uniform wafer-scale Au nanogap SERS substrate for quantitative analysis of carbaryl pesticide levels in different food samples. The substrate was able to detect carbaryl up to 3 ppb in concentration with low LOD values. The combination of VIP method and PLSR achieved high predictive accuracy and differentiation ability for different concentrations and adulteration of carbaryl in food samples.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Physical
Victor Meana, Eduardo Cuesta, Braulio J. Alvarez, Sara Giganto, Susana Martinez-Pellitero
Summary: This paper presents a comparative study on the influence of two surface treatments on the suitability of metallic spheres for the calibration of optical sensors. The results show that acid etching produces better optical qualities but also affects the metrological characteristics of the spheres to a greater extent than sandblasting.
Article
Engineering, Electrical & Electronic
Nguyen Van Minh, Dang Van Hieu, Pham Van Tuan, Nguyen Duc Dung, Chu Manh Hoang
Summary: Silicon nano-pillars array can be fabricated on silicon wafer using nano-sphere lithography and metal assisted chemical etching. The height and diameter of the SiNPs are controlled by etching time and NSL respectively. The structural morphology and optical characteristics of the fabricated SiNPs are comprehensively investigated.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Analytical
Cai-jun Wu, Si-qi Huang, Yu-ying Wang, Ya-qin Chai, Ruo Yuan, Xia Yang
Summary: The study involves stabilizing self-assembled Au NPs on the liquid-liquid interface using DNA structures, combined with DNA recycling amplification strategy to construct a liquid-phase SERS biosensor for efficient detection of miRNA 155. Compared to traditional methods, the SERS signal is significantly enhanced, detection limit is lower, and linear range wider.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Youhai Liu, Nan Zhang, Dylan Tua, Yingkun Zhu, Jacob Rada, Wenhong Yang, Haomin Song, Alexis C. Thompson, R. Lorraine Collins, Qiaoqiang Gan
Summary: A superhydrophobic SERS chip combining 3D-assembled gold nanoparticles on nanoporous substrates is proposed for sensitive analyte enrichment. The chip demonstrates a sensitivity of 1 nm and a relative standard deviation of 2.2% for chip-to-chip reproducibility, showing potential for quantitative sensing of chemicals and drugs. It also enables trace analysis of fentanyl and fentanyl-heroin mixture in human saliva. This superhydrophobic chip paves the way for on-site and real-time drug sensing to tackle societal issues like drug abuse and the opioid crisis.
