Effect of the Duty Cycle of Flower-like Silver Nanostructures Fabricated with a Lyotropic Liquid Crystal on the SERS Spectrum

Zhang, Shen; Jiang, Zhuangde; Liang, Yijin; Shen, Yili; Mao, Hongmin; Sun, Hong‐Bo; Zhao, Xin; Li, Xiaoping; Hu, Wusheng; Cao, Zhaoliang

doi:10.3390/molecules26216522

Cited by 3 publications

(5 citation statements)

References 43 publications

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“…Normally, the silver plate and ITO glass are used as the anode and cathode, respectively, to prepare the SERS substrate [40,41,43,44] . However, the silver plate is rough.…”

Section: Measurement Of the Surface Flatness Of The Electrodesmentioning

confidence: 99%

“…To simplify the calculation, the SERS substrate is regarded as a two-dimensional plane structure. Thus, the surface coverage r of the measured region can be written as [43] r = S nano S exciting , 2…”

Section: Calculation Of the Surface Homogeneity Of The Sers Substratementioning

confidence: 99%

“…However, compared with the substrate fabricated with lithography, the spectrum uniformity of the SERS substrate is weaker while it is prepared with these low-cost methods. For improving the spectrum uniformity of the SERS substrate, our work group proposed a surface coverage method, in which the relation between the duty cycle of the nanostructure and the spectrum intensity was obtained and the spectrum uniformity was improved with the data processed [43,44] . However, as this method is complicated and it depends on the computation, it is unsuitable for actual applications of the SERS substrate.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of Raman spectrum uniformity of SERS substrate based on flat electrode

Jiang,

Zhang,

Song

et al. 2023

中国光学快报

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The distribution of metal nanoparticles on the surface of a surface enhancement Raman scattering (SERS)-active substrate plays a prominent part in not only the enhancement of Raman vibration signal, but also the spectrum uniformity. Here, a facile method to fabricate SERS substrates with excellent homogeneity and low cost was proposed, in which a lyotropic liquid crystal soft template was introduced for the coordinated growth of the silver nanoflowers in the process of electrochemistry deposition. Simulation was carried out to illustrate the dominated influence of the distance of electrodes on the deposited nanoparticle number. Two kinds of conductive materials, silver plate and indium tin oxide (ITO) glass, were chosen as the anode, while the cathode was fixed as ITO glass. The simulated conjecture on the effect of electrode flatness on the uniformity of deposited nanoparticles in silver is experimentally proved. More importantly, it was demonstrated that with a relatively smooth and flat ITO glass anode, a SERS substrate featuring higher spectrum uniformity could be achieved. This work is of great significance to the actual applications of the SERS substrate for quantitative detection with high sensitivity.

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“…Normally, the silver plate and ITO glass are used as the anode and cathode, respectively, to prepare the SERS substrate [40,41,43,44] . However, the silver plate is rough.…”

Section: Measurement Of the Surface Flatness Of The Electrodesmentioning

confidence: 99%

Section: Calculation Of the Surface Homogeneity Of The Sers Substratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improvement of Raman spectrum uniformity of SERS substrate based on flat electrode

Jiang,

Zhang,

Song

et al. 2023

中国光学快报

Self Cite

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“…Typically, antibodies can be deposited on the surface of the nanostructured metal substrate—SERS substrate—through electrostatic forces, biotin–avidin specific adsorption, and covalent immobilizations [ 144 ]. An antibody-based SERS sensor was developed for ultrasensitive α-lactalbumin detection in raw cow milk, ultra-heat-treated cow milk, walnut milk drink, and peanut milk drink [ 145 ]. The antibody-based SERS sensor could directly detect α-lactalbumin with a limit of detection as low as 0.01 ng/mL.…”

Section: Nanotechnology In Food Monitoringmentioning

confidence: 99%

Recent Progress in Nanotechnology-Based Approaches for Food Monitoring

et al. 2022

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Throughout the food supply chain, including production, storage, and distribution, food can be contaminated by harmful chemicals and microorganisms, resulting in a severe threat to human health. In recent years, the rapid advancement and development of nanotechnology proposed revolutionary solutions to solve several problems in scientific and industrial areas, including food monitoring. Nanotechnology can be incorporated into chemical and biological sensors to improve analytical performance, such as response time, sensitivity, selectivity, reliability, and accuracy. Based on the characteristics of the contaminants and the detection methods, nanotechnology can be applied in different ways in order to improve conventional techniques. Nanomaterials such as nanoparticles, nanorods, nanosheets, nanocomposites, nanotubes, and nanowires provide various functions for the immobilization and labeling of contaminants in electrochemical and optical detection. This review summarizes the recent advances in nanotechnology for detecting chemical and biological contaminations in the food supply chain.

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“…First, a SERS substrate with an Ag nanoflower structure was prepared using electrochemical growth assisted by lyotropic liquid crystal (LC) soft templates. [26][27][28] Then, the external oxygen barrier method was carried out by insulating the substrate from air. A vacuum group, an argon group, and an air control group were established for comparison.…”

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Raman Spectroscopy Substrate Time Stability Improvement Using an External Oxygen Barrier Method

Song,

Li,

Jiang

et al. 2024

Appl Spectrosc

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The poor time stability of surface-enhanced Raman scattering (SERS) substrates greatly limits their application potential. Although core–shell structures are commonly used to enhance stability, their complex preparation processes, high costs, and susceptibility under acidic or alkaline conditions result in serious disadvantages for practical applications. Here, we propose a new method of external oxygen barrier to improve spectral stability, in which SERS substrates are stored in an oxygen-free environment. Controlled experiments are carried out under air and vacuum. Raman spectrum intensity is measured 11 times within six months for each group. Using the attenuation formula, the Raman spectrum intensity decay results of each SERS substrate over time are obtained. The effectiveness of the external oxygen barrier method is demonstrated through curve fitting using the corresponding function. The substrate spectral attenuation rates of the vacuum group and the argon group within six months are <20%, proving the effectiveness of the external oxygen barrier method.

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Effect of the Duty Cycle of Flower-like Silver Nanostructures Fabricated with a Lyotropic Liquid Crystal on the SERS Spectrum

Cited by 3 publications

References 43 publications

Improvement of Raman spectrum uniformity of SERS substrate based on flat electrode

Improvement of Raman spectrum uniformity of SERS substrate based on flat electrode

Recent Progress in Nanotechnology-Based Approaches for Food Monitoring

Surface-Enhanced Raman Spectroscopy Substrate Time Stability Improvement Using an External Oxygen Barrier Method

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