Sustainable nanoporous gold with excellent SERS performances

Raj, Deepti; Palumbo, Mauro; Fiore, Gianluca; Celegato, Federica; Scaglione, Federico; Rizzi, Paola

doi:10.1016/j.matchemphys.2022.126883

Cited by 8 publications

(3 citation statements)

References 73 publications

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“…Very often nanoporous metallic nanoparticles are produced by using a combination of lithographic techniques (Section 3.2.1) and dealloying methods. An example is the synthesis of nanoporous gold nanoparticles, by depositing gold and silver on a substrate made of a silicon wafer or a glass slide [89,90].…”

Section: Plasmonic Properties Of Metalsmentioning

confidence: 99%

Synthesis, Characterization and Applications of Sustainable Advanced Nanomaterials

2023

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Section: Plasmonic Properties Of Metalsmentioning

confidence: 99%

Synthesis, Characterization and Applications of Sustainable Advanced Nanomaterials

2023

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“…[ 25 ] So far, several different approaches to the synthesis of nanoporous gold thin films have been investigated. [ 26 ] These methods include sputtering, templating, dealloying, self‐assembling, and electrodeposition. [ 27 ]…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Au‐Decorated Al Nanoconcavities Platform for Augmented SERS

Dar,

Xifre‐Perez,

Marsal

2023

Adv Materials Inter

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A robust and competitive technology to synthesize arranged high‐density gold nanoparticles on highly uniform Al nanoconcavities substrates is presented. The nanoparticles are formed through sputtering and thermal annealing treatment on Al templates, which are synthesized through particular removal of nanoporous anodic alumina structure with controlled anodization conditions and with phosphoric acid as electrolyte. This scalable fabrication mechanism regulates the particle size, arrangement, shape and interparticle separation across large surface areas, which empowers the optimization of their surface enhanced Raman scattering (SERS) activities. 4‐mercaptopyridine is selected as a probe molecule. Analysis reveals that Au‐decorated Al nanoconcavities substrates are highly competitive for the enhancement of Raman signals and could be employed as self‐sustaining nanosensors. By using these templates, a concentration as low as 10−7 M of 4‐mercaptopyridine is easily detected. Finally, the calculated EF factor of 1.1 × 107 confirms the suitability for effective and sensitive SERS detection of the developed substrates.

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“…Research to develop materials for SERS has focused on gold and silver nanostructures, since these possess the most significant enhancement factor. Silver nanoparticles, , gold nanorods, , and nanoporous gold surfaces , have been used as materials to fabricate SERS sensors. The simple fabrication of affordable, hierarchically structured materials that convey a large SERS effect remains a key goal in the field of SERS sensors.…”

Section: Introductionmentioning

confidence: 99%

Simple and Inexpensive Fabrication of High Surface-Area Paper-Based Gold Electrodes for Electrochemical and Surface-Enhanced Raman Scattering Sensing

González-Martínez,

Rekas,

Moran-Mirabal

2023

ACS Appl. Mater. Interfaces

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Paper has emerged as an excellent alternative to create environmentally benign disposable electrochemical sensing devices. The critical step to fabricating electrochemical sensors is making paper conductive. In this work, paper-based electrodes with a high electroactive surface area (ESA) were fabricated using a simple electroless deposition technique. The polymerization time of a polydopamine adhesion layer and the gold salt concentration during the electroless deposition step were optimized to obtain uniformly conductive paper-based electrodes. The optimization of these fabrication parameters was key to obtaining the highest ESA possible. Roughening factors (R f) of 7.2 and 2.3 were obtained when cyclic voltammetry was done in sulfuric acid and potassium ferricyanide, respectively, demonstrating a surface prone to fast electron transfer. As a proof of concept, mercury detection was done through anodic stripping, achieving a limit of quantification (LOQ) of 0.9 ppb. By changing the metal deposition conditions, the roughness of the metalized papers could also be tuned for their use as surface-enhanced Raman scattering (SERS) sensors. Metallized papers with the highest SERS signal for thiophenol detection yielded a LOQ of 10 ppb. We anticipate that this method of fabricating nanostructured paper-based electrodes can accelerate the development of simple, cost-effective, and highly sensitive electrochemical and SERS sensing platforms.

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Sustainable nanoporous gold with excellent SERS performances

Cited by 8 publications

References 73 publications

Synthesis, Characterization and Applications of Sustainable Advanced Nanomaterials

Synthesis, Characterization and Applications of Sustainable Advanced Nanomaterials

Fabrication of Au‐Decorated Al Nanoconcavities Platform for Augmented SERS

Simple and Inexpensive Fabrication of High Surface-Area Paper-Based Gold Electrodes for Electrochemical and Surface-Enhanced Raman Scattering Sensing

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