One-pot synthesis of Pt hollow spheres and their performance on electrochemical catalysis

Lin, Guanhua; Liu, Wensheng

doi:10.1039/c5nj00595g

Cited by 8 publications

(7 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…nanoparticles, nanocubes, nanorods, etc. 8,9 Solid plasmonic nanocrystals have been used for numerous applications such as catalysis, 10,11 bioimaging, 12,13 biosensing, 14−16 SERS, 17,18 drug delivery, 1,19−21 photothermal therapy, 22,23 thin film solar cells, 24 storage media, 25 and optoelectronics. 26 However, plasmon hybridization 27 in the hollow nanostructures makes them a better candidate over the solid nanoparticles for biomedical applications due to enhanced tunability range from visible to near-IR.…”

Section: Introductionmentioning

confidence: 99%

Folate-Directed Shape-Transformative Synthesis of Hollow Silver Nanocubes: Plasmon Tunability, Growth Kinetics, and Catalytic Applications

Dadhich

Bhushan

Saha

et al. 2018

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

A unique role of folate as a shape-and structuredirecting agent has been found in nanosynthesis. Folate-capped Ag 2 O nanospheres transformed into hollow silver nanocubes (HAgNCs) having spherical void spaces during reduction with hydrazine hydrate (HH). HAgNCs with tunable plasmon peaks (λ SPR ) at 510, 550, 570, 590, and 630 nm were synthesized (hence named as respectively). The corresponding edge-lengths were 33 ± 4, 45 ± 8, 60 ± 8, 70 ± 10 and 100 ± 15 nm as determined by HRTEM and the aspect ratio (edge length/void diameter) remained constant at 2.3. The plasmon peak varied linearly while the molar extinction coefficient scaled exponentially with edge-length. The maximum red-shift was obtained with a molar ratio of 1:0.33:150 for Ag + :folate:HH at 50 °C with a stirring speed of 180 rpm. However, zero rpm synthesis yielded HAgNC-510 having lowest fwhm signifying high monodispersity. Within a short time span of 6−50 s, the particle-evolution was completed. It followed first-order kinetics with a faster reduction occurring at zero rpm. In addition, the HAgNCs were found to be good catalysts in dark as well as in sunlight, for the degradation of a model dye, methyl orange (MO). HAgNC-630 exhibited 3.3 times higher catalytic efficiency in sunlight as compared to solid silver nanospheres (λ SPR = 400 nm). Thus, the red-end of the visible solar spectrum displayed greater efficiency with HAgNCs as plasmonic photocatalysts.

show abstract

Section: Introductionmentioning

confidence: 99%

Folate-Directed Shape-Transformative Synthesis of Hollow Silver Nanocubes: Plasmon Tunability, Growth Kinetics, and Catalytic Applications

Dadhich

Bhushan

Saha

et al. 2018

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…C18ADPA is a new member of a recently explored family of dendritic surfactants 30 – 32 , and is synthesized via a simple procedure from cheap starting materials (see Methods and Materials). Such compounds have already found their way in preparation of a host of different gold 18 , 31 , 33 , 34 , silver 35 and platinum 36 nanomaterials. We believe due to the added versatility brought about by this transition, new previously unexplored pathways will be opened in applications of dendritic surfactants.…”

Section: Resultsmentioning

confidence: 99%

A unique thermo-induced gel-to-gel transition in a pH-sensitive small-molecule hydrogel

Xie

Ayoubi

Liu

et al. 2017

Sci Rep

Self Cite

View full text Add to dashboard Cite

For a hydrogel based on a zwitterionic dendritic surfactant, we report an apparently unprecedented reversible temperature-induced gel-to-gel phase transition below the melting point of its alkyl chains, where the supramolecular self-assembly of surfactant molecules underwent a dramatic transformation from low-temperature surfactant bilayers to high-temperature entangled surfactant worm-like micelles.

show abstract

“…Hollow nanostructures of noble metals exhibit an interesting phenomenon of “plasmon hybridization” on account of the interaction of plasmons on two surfaces, inner and outer ones. Owing to the possibility of alteration in their plasmonic properties by the materials’ internal structure, they offer a wide range of applications from bioimaging, , catalysis, , drug delivery , to optoelectronics. , Furthermore, the hollow noble metal nanoparticles (NPs) are likely to exhibit extraordinary NLA properties due to the intense electromagnetic (EM) interaction leading to the local field enhancement (LFE) effect . To the best of our knowledge, no such studies on hollow plasmonic nanomaterials have been reported to date.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond-Laser-Induced Saturable Absorption and Optical Limiting of Hollow Silver Nanocubes: Implications for Optical Switching and Bioimaging

Dadhich

Bhattacharya

Ballav

et al. 2020

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The effects of shape, size, and surface plasmon resonance (SPR) peak position (λ SPR ) on nonlinear absorption (NLA) were investigated at 808 nm, using a femtosecond laser. We found that NLA behavior is the result of competition between saturable absorption (SA) and reverse saturable absorption (RSA). SA behavior, i.e., optical transparency in silver nanocrystals, is introduced by the change in shape and structure from solid nanospheres to hollow nanocubes. For the latter, SA behavior dominates at low input irradiance, while RSA dominates at higher laser powers. A series of hollow silver nanocubes (HAgNCs) was synthesized that exhibit SPR peaks at 510, 550, 590, and 630 nm, hence named as HAgNC-510, HAgNC-550, HAgNC-590, and HAgNC-630, respectively. The edge lengths (l) of HAgNC-510, HAgNC-550, HAgNC-590, and HAgNC-630 were determined to be 33 ± 4, 45 ± 8, 70 ± 10, and 100 ± 15 nm. The switching of SA to RSA occurred at lower laser power for larger HAgNCs as compared to the smaller ones. The saturation intensity (I sat ) was found to vary linearly with the size of HAgNCs. Moreover, for a four-times rise in input pulse intensity (63 → 252 GW/cm 2 ), a huge increase of 3650% in the NLA coefficient, β eff , was observed for HAgNC-590, whereas merely 19% increase was found for the solid silver nanoparticles (SAgNP-400). The extraordinary enhancement in β eff is attributed to the enhanced electric field at the sharp edges and corners of the nanocubes. The red-tailing of SPR peaks also had a significant effect on the values of β eff . The outcomes, i.e., optical transparency and SA−RSA switching, will open vistas for a variety of diverse applications such as optical switching, limiting, and bioimaging.

show abstract

One-pot synthesis of Pt hollow spheres and their performance on electrochemical catalysis

Abstract: The facile synthesis of Pt hollow spheres with variable sizes was achieved using a surfactant with a long hydrophobic tail.

Cited by 8 publications

References 34 publications

Folate-Directed Shape-Transformative Synthesis of Hollow Silver Nanocubes: Plasmon Tunability, Growth Kinetics, and Catalytic Applications

Folate-Directed Shape-Transformative Synthesis of Hollow Silver Nanocubes: Plasmon Tunability, Growth Kinetics, and Catalytic Applications

A unique thermo-induced gel-to-gel transition in a pH-sensitive small-molecule hydrogel

Femtosecond-Laser-Induced Saturable Absorption and Optical Limiting of Hollow Silver Nanocubes: Implications for Optical Switching and Bioimaging

Contact Info

Product

Resources

About