Reversible Thermoelectric Regulation of Electromagnetic and Chemical Enhancement for Rapid SERS Detection

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(9), С. 12085 - 12094

Опубликована: Фев. 22, 2024

Actively controlling surface-enhanced Raman scattering (SERS) performance plays a vital role in highly sensitive detection or situ monitoring. Nevertheless, it is still challenging to achieve further modulation of electromagnetic enhancement and chemical simultaneously SERS detection. In this study, silver nanocavity structure with graphene as spacer layer coupled thermoelectric semiconductor P-type gallium nitride (GaN) form an electric-field-induced (E-SERS) for dual enhancement. After applying the electric field, intensity signals enhanced by over 10 times. The field enables fast reproducible doping graphene, thereby modulating its Fermi level wide range. also regulates position plasmon resonance peak structure, rendering synchronous regulation. Additionally, method trace severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A detailed theoretical analysis performed based on experimental results finite-element calculations, paving way fabrication high-efficient E-SERS substrates.

Язык: Английский

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Flexible Multicavity SERS Substrate Based on Ag Nanoparticle-Decorated Aluminum Hydrous Oxide Nanoflake Array for Highly Sensitive In Situ Detection

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(27), С. 35771 - 35780

Опубликована: Июнь 27, 2024

Flexible surface-enhanced Raman scattering (SERS) substrates are very promising to meet the needs for real-time and on-field detection in practical applications. However, high-performance flexible SERS often suffer from complexity high cost fabrication, limiting their widespread Herein, we developed a facile method fabricate multicavity substrate composed of silver nanoparticle (AgNP)-decorated aluminum hydrous oxide nanoflake array (NFA) grown on polydimethylsiloxane (PDMS) membrane. Strong plasmon couplings promoted by multiple nanocavities afford high-density hotspots within such AgNPs@NFA/PDMS film, boosting sensitivity with an enhancement factor (EF) ∼1.54 × 109, limit (LOD) ∼7.4 10-13 M rhodamine 6G (R6G) molecules. Furthermore, benefiting sensitivity, mechanical stability, transparency this substrate, situ detections trace thiram crystal violet (CV) molecules surface cherry tomatoes fish have been realized, LODs much lower than maximum allowable food, demonstrating great potential food safety monitoring. More importantly, preparation processes simple environmentally friendly, techniques involved completely compatible well-established silicon device technologies. Therefore, large-area fabrication low can be readily enabling extensive applications sensors daily life.

Язык: Английский

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Advancements in reusable SERS substrates for trace analysis applications

Talanta, Год журнала: 2024, Номер 279, С. 126640 - 126640

Опубликована: Июль 31, 2024

Язык: Английский

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Anisotropic V-Groove/Wrinkle Hierarchical Arrays for Multidirectional Strain Sensors with High Sensitivity and Exceptional Selectivity

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(22), С. 29410 - 29420

Опубликована: Май 20, 2024

Flexible strain sensors have been continuously optimized and widely used in various fields such as health monitoring, motion detection, human–machine interfaces. There is a higher demand for that can sensitively identify both the amplitude direction real-time to adapt complex human movements. This study proposes flexible sensor construction strategy based on V-groove/wrinkle hierarchical structures via facile scalable prestretching approach. A gold film sputtered V-groove structure soft substrate under vertical biaxial prestrain. When released, variety of wondrous are formed. The microstructure properties resulting be controlled by adjusting prestrain, which has obvious anisotropic response characteristics exhibits high sensitivity (maximum gauge factor up 20,727.46) wide sensing range (up 51%). In addition, multidirectional double-sided microstructures an exceptional directional selectivity 67.39, at advanced level among all stretchable reported so far. detect signals distinguish patterns, proving its great potential field detection laying foundation high-performance wearable devices.

Язык: Английский

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High SERS performance of functionalized carbon dots in the detection of dye contaminants

Journal of Advanced Research, Год журнала: 2024, Номер unknown

Опубликована: Фев. 1, 2024

The long-term overuse of malachite green (MG) has potential carcinogenic, teratogenic, and mutagenic effects. functional nanocomposite is novel challenging to construct implement through surface enhanced Raman scattering (SERS) strategy reveal the contributions in application. Ag-CDs (carbon dots)-PBA (phenyl boric acid) was constructed by a facile route detect toxic MG molecule with high SERS sensitivity good uniformity. substrate used for detection been successfully using PBA modulated on structured rich binding sites. fabricated Ag-CDs-PBA can be analyze various probe molecules exhibiting sensitivity, signal reproducibility, excellent stability. mechanism between components proved calculations originating from plasmonic Ag active electronic transmission among bridging CDs via close spatial π-π effect. In addition, accelerated separation electron-hole pairs triggered further improve activity hybrid bidirectional charge transfer (CT) process. Significantly, system shows distinctive selectivity, which hinder interference other species without specific hydroxyl groups. Based this deeper insight plasmon-mediated mechanism, practiced quantitative determination real water fish samples. developed promises new sensor technology great environmental food safety applications.

Язык: Английский

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Gold-Deposited Graphene Nanosheets for Self-Cleaning Graphene Surface-Enhanced Raman Spectroscopy with Superior Charge-Transfer Contribution

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(8), С. 10969 - 10983

Опубликована: Фев. 14, 2024

The interaction of graphene with metals initiates charge-transfer interaction-induced chemical enhancements, which critically depend on the doping effect from deposited metallic configurations. In this paper, we have explored gold nanoparticle-decorated monolayer nanosheets for large graphene-induced Raman enhancement adsorbed analytes, indicating surface-enhanced spectroscopy (SERS) capabilities metal-doped (G-SERS). Here, systematically sputtered Au thickness optimization procedure revealed noticeable modifications in spectra and photoluminescence (PL) background quenching, indicated favorable charge transfer through n-type vapor deposition-grown nanosheets. highly consistent, individually distributed morphology nanoislands over depicted a reproducibly uniform G-SERS signal excellent relative standard deviation values (<5%), resulting strongest intensity factors ∼108 (MB) (methylene blue) 107 (DPA) (2,6-pyridinedicarboxylic acid) composed weakest PL background. combined charge-transfer-induced electromagnetic individual result lowering detectability down to 10–16 M 10–11 concentrations efficient time-dependent stability. Additionally, GAu demonstrated its effective (∼94.4%) photocatalytic degradation by decomposing MB dye molecules concentration 1 μM 2.52 fM within 60 min. Therefore, prominent contribution controlled decoration provides potential strategy fabricating superior SERS sensors photocatalysts exhibiting adequate consistency, stability, photodegradation efficiency overcoming limitations traditional sensing platforms.

Язык: Английский

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Construction of PVDF-HKUST-1/BiVO4 hybrid electrospun flexible fiber membrane for enhanced piezo-photocatalytic reduction performance of Cr(VI)

Colloids and Surfaces A Physicochemical and Engineering Aspects, Год журнала: 2024, Номер 693, С. 134046 - 134046

Опубликована: Апрель 22, 2024

Язык: Английский

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Multifunctional engineering on the ultrasensitive driven-dual plasmonic heterogenous dimer system of 1D semiconductor for accurate SERS sensitivity and quantitation

Journal of Science Advanced Materials and Devices, Год журнала: 2024, Номер 9(1), С. 100670 - 100670

Опубликована: Янв. 10, 2024

Self-assembled functional nanomaterials with electromagnetic (EM) hot spots and chemical (CM) enhancement have been recognized as a key in surface-enhanced Raman scattering (SERS) analysis. Herein, dual-hybrid plasmonic coupling SERS sensor composed of rutile TiO2 nanorod arrays (r-TNRs), Au nanospheres (AuNSs), Ag nanocubes (AgNCs) has designed to achieve ultrasensitive detection obtain unique molecular fingerprints. The AgNCs/AuNSs/r-TNRs-based chip shows an extremely promising factor (EF) 1.2 ×1011, detectability at sub-picomolar concentrations (down the single-molecule level, 10-13 M), excellent signal reproducibility relative standard deviation (RSD) 3.4 %. Furthermore, this system applied for fingerprint complex mixtures, demonstrating impressive specificity accuracy. photocatalytic decomposition efficiency AgNCs/AuNSs/r-TNRs platform reaches approximately ∼99 % within 20 min. Additionally, intensity crystal violet only declined by 15 after 21 days, illustrating outstanding stability as-proposed ternary sensor.

Язык: Английский

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Tailorable janus plasmonic SERS platform with hotspots integrating and analytes enriching property for multiple sensing

Sensors and Actuators B Chemical, Год журнала: 2024, Номер 413, С. 135721 - 135721

Опубликована: Апрель 30, 2024

Язык: Английский

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Interfacial Self-Assembly of Surfactant-Free Au Nanoparticles as a Clean Surface-Enhanced Raman Scattering Substrate for Quantitative Detection of As⁵⁺ in Combination with Convolutional Neural Networks

The Journal of Physical Chemistry Letters, Год журнала: 2023, Номер 14(32), С. 7290 - 7298

Опубликована: Авг. 10, 2023

Surface-enhanced Raman scattering (SERS) is a highly sensitive tool in the field of environmental testing. However, detection and accurate quantification weakly adsorbed molecules (such as heavy metal ions) remain challenge. Herein, we combine clean SERS substrates capable capturing ions with convolutional neural network (CNN) algorithm models for quantitative solution. The substrate consists surfactant-free Au nanoparticles (NPs) l-cysteine molecules. As plasmonic nanobuilt blocks, NPs without physical or chemical barriers are more accessible to target amino carboxyl groups molecule can chelate As5+ ions. CNN model applied quantify predict concentration samples. results demonstrated that this strategy allows fast prediction ion concentrations, determination coefficient between predicted actual values high 0.991.

Язык: Английский

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