Undergraduate Laboratory Experiment Modules for Probing Gold Nanoparticle Interfacial Phenomena

Karunanayake, Akila G.; Gunatilake, Sameera R.; Ameer, Fathima S.; Gadogbe, Manuel; Smith, Laura T.; Mlsna, Deb; Zhang, Dongmao

doi:10.1021/acs.jchemed.5b00535

Cited by 18 publications

(17 citation statements)

References 20 publications

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“…The protons generated by the Ag + binding are due likely to the Ag + reaction with citrate or its reaction by-product that contain intact carboxylic groups. The as-synthesized AuNPs are weakly acidic with a pH value of around 5 (Gadogbe et al, 2013; Karunanayake et al, 2015). The surface bound citrates most likely bear substantial amount of the ionizable protons.…”

Section: Resultsmentioning

confidence: 99%

Surface Plasmon Resonance, Formation Mechanism, and Surface Enhanced Raman Spectroscopy of Ag+-Stained Gold Nanoparticles

Athukorale

Leng

et al. 2019

Front. Chem.

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A series of recent works have demonstrated the spontaneous Ag + adsorption onto gold surfaces. However, a mechanistic understanding of the Ag + interactions with gold has been controversial. Reported herein is a systematic study of the Ag + binding to AuNPs using several in-situ and ex-situ measurement techniques. The time-resolved UV-vis measurements of the AuNP surface plasmonic resonance revealed that the silver adsorption proceeds through two parallel pseudo-first order processes with a time constant of 16(±2) and 1,000(±35) s, respectively. About 95% of the Ag + adsorption proceeds through the fast adsorption process. The in-situ zeta potential data indicated that this fast Ag + adsorption is driven primarily by the long-range electrostatic forces that lead to AuNP charge neutralization, while the time-dependent pH data shows that the slow Ag + binding process involves proton-releasing reactions that must be driven by near-range interactions. These experimental data, together with the ex-situ XPS measurement indicates that adsorbed silver remains cationic, but not as a charged-neutral silver atom proposed by the anti-galvanic reaction mechanism. The surface-enhanced Raman activities of the Ag + -stained AuNPs are slightly higher than that for AuNPs, but significantly lower than that for the silver nanoparticles (AgNPs). The SERS feature of the ligands on the Ag + -stained AuNPs can differ from that on both AuNPs and AgNPs. Besides the new insights to formation mechanism, properties, and applications of the Ag + -stained AuNPs, the experimental methodology presented in this work can also be important for studying nanoparticle interfacial interactions.

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Section: Resultsmentioning

confidence: 99%

Surface Plasmon Resonance, Formation Mechanism, and Surface Enhanced Raman Spectroscopy of Ag+-Stained Gold Nanoparticles

Athukorale

Leng

et al. 2019

Front. Chem.

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“…With the increasing incorporation of nanotechnology into the science and engineering curriculum, innovative approaches have been used to add laboratory components to coursework. Although other topics such as nanoparticle dose quantification, interfacial properties, , and interactions with the environment, , are starting to gain momentum, many of the current approaches are still focused on nanoparticle synthesis. The proposed set of experiments, as part of a newly developed “Nano and Biointerfaces” course, focused on another equally important aspect of nanotechnology by familiarizing students with nanoparticle characterization techniques and the required analysis after each experiments.…”

Section: Discussionmentioning

confidence: 99%

Novel Experimental Modules To Introduce Students to Nanoparticle Characterization in a Chemical Engineering Course

Vahedi

Farnoud

2019

J. Chem. Educ.

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The increasing industrial and biomedical applications of nanomaterials have enhanced the need to educate a well-trained nanotechnology workforce. This need has led to efforts to introduce hands-on, nanotechnologybased, experimental modules into high school and college level courses in science and engineering. However, the majority of such efforts have focused on nanoparticle synthesis techniques, and an equally important aspect of working with nanomaterials, nanoparticle characterization, has received less attention. Herein, we report a series of nanoparticle characterization experiments, as part of a newly developed "Nano and Biointerfaces" course, to familiarize upper undergraduate students as well as graduate students in chemical engineering with nanoparticle characterization techniques. An inquiry-based approach was used in that the composition and properties of nanoparticles were not revealed to the students beforehand and students were asked to perform experiments to characterize nanoparticle composition, size, morphology, and surface area. The results of these experiments were compared with certificates of analysis for particles, provided by the vendor, and the differences in measured properties were discussed. Assessment was performed through evaluation of laboratory memos and presentations, a question in the end-of-semester final exam, and a student survey. The modular nature of these experiments allows for them to be implemented, with modifications as needed, in other higher education institutions or in high schools to familiarize students with nanoparticle characterization.

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“…There is an urgent need for nanoscience education and emerging processing techniques for upper-division undergraduates and graduate students. Several groups have focused on the unique properties of nanoparticles in laboratory experiments to help students understand nanochemistry. − For instance, Fitzkee et al used nuclear magnetic resonance spectroscopy to help students understand the interactions of gold nanoparticles and proteins. Wheeler et al implemented an ecotoxicity experiment with silver nanoparticles to help students learn about nanoscience.…”

Section: Introductionmentioning

confidence: 99%

Hands-on Experiments for the Application of a Flexible, Conductive Nanomaterial Utilizing Silver-Nanopaste-Incorporated Tracks

Lai

Sung

et al. 2020

J. Chem. Educ.

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A series of hands-on experiments including the synthesis and application of flexible, conductive silver-nanopaste were designed to gain knowledge of conductive soft nanomaterial and the synthesis and the application of silver nanopaste (Ag nanopaste). The aim of this laboratory experiment is to provide undergraduate/graduate students an introduction to flexible, conductive electronics by the preparation of silver-nanopaste-incorporated tracks. For Ag-nanopaste-based electronics, the packability of silver nanoparticles and the sintering process are two major factors that dominate the conductivity of the device. In this experiment, ethylene glycol and polyvinylpyrrolidone were utilized to synthesize Ag nanopaste from AgNO3 via chemical reduction. The application of this flexible, conductive nanomaterial was demonstrated using Ag-nanopaste-incorporated tracks with a photonic sintering process. The process of photonic sintering is used in this experiment to reduce processing time. Prior to performing hands-on laboratory experiments, students learned about the properties, synthesis, and applications of flexible, conductive nanomaterials in class. A questionnaire was administered after the hands-on experiments to acquire student feedback on the course design. A simple quiz was also completed by the students before and after the hands-on experiments for evaluation.

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Undergraduate Laboratory Experiment Modules for Probing Gold Nanoparticle Interfacial Phenomena

Cited by 18 publications

References 20 publications

Surface Plasmon Resonance, Formation Mechanism, and Surface Enhanced Raman Spectroscopy of Ag+-Stained Gold Nanoparticles

Surface Plasmon Resonance, Formation Mechanism, and Surface Enhanced Raman Spectroscopy of Ag+-Stained Gold Nanoparticles

Novel Experimental Modules To Introduce Students to Nanoparticle Characterization in a Chemical Engineering Course

Hands-on Experiments for the Application of a Flexible, Conductive Nanomaterial Utilizing Silver-Nanopaste-Incorporated Tracks

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