Plasmon Assisted Highly Efficient Visible Light Catalytic CO2 Reduction Over the Noble Metal Decorated Sr-Incorporated g-C3N4

AbstractThe photocatalytic performance of g-C3N4 for CO2 conversion is still inadequate by several shortfalls including the instability, insufficient solar light absorption and rapid charge carrier’s recombination rate. To solve these problems, herein, noble metals (Pt and Au) decorated Sr-incorporated g-C3N4 photocatalysts are fabricated via the simple calcination and photo-deposition methods. The Sr-incorporation remarkably reduced the g-C3N4 band gap from 2.7 to 2.54 eV, as evidenced by the UV–visible absorption spectra and the density functional theory results. The CO2 conversion performance of the catalysts was evaluated under visible light irradiation. The Pt/0.15Sr-CN sample produced 48.55 and 74.54 µmol h−1 g−1 of CH4 and CO, respectively. These amounts are far greater than that produced by the Au/0.15Sr-CN, 0.15Sr-CN, and CN samples. A high quantum efficiency of 2.92% is predicted for the Pt/0.15Sr-CN sample. Further, the stability of the photocatalyst is confirmed via the photocatalytic recyclable test. The improved CO2 conversion performance of the catalyst is accredited to the promoted light absorption and remarkably enhanced charge separation via the Sr-incorporated mid gap states and the localized surface plasmon resonance effect induced by noble metal nanoparticles. This work will provide a new approach for promoting the catalytic efficiency of g-C3N4 for efficient solar fuel production.

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Visible Light-Mediated Sustainable Antibacterial Activity and Osteogenic Functionality of Au and Pt Multi-Coated TiO2 Nanotubes

Materials ◽

10.3390/ma14205976 ◽

2021 ◽

Vol 14 (20) ◽

pp. 5976

Author(s):

Kyoung-Suk Moon ◽

Young-Bum Park ◽

Ji-Myung Bae ◽

Eun-Joo Choi ◽

Seung-Han Oh

Keyword(s):

Antibacterial Activity ◽

Visible Light ◽

Metal Nanoparticles ◽

Noble Metal ◽

Noble Metals ◽

Human Mesenchymal Stem Cells ◽

Antibacterial Activities ◽

Titania Nanotubes ◽

Noble Metal Nanoparticles ◽

Low Level Laser Therapy

The visible light reactions of noble metal-based photocatalysts have been increasingly utilized to investigate their antibacterial activities. Furthermore, the photoreactions at various visible light wavelengths for specific combinations of titania nanotubes and noble metal nanoparticles have been found to promote osteogenic functionality. In this investigation, a novel multi-coating combination of noble metals (gold and platinum) on titania nanotubes was assessed using plasmonic photocatalysis and low-level laser therapy at 470 and 600 nm. The results showed that this coating on the nanotubes promoted antibacterial activity and osteogenic functionality. The order in which the gold and platinum coatings were layered onto the titania nanotubes strongly affected the osteogenic performance of the human mesenchymal stem cells. These results have identified a new approach for the development of efficient novel combinations of noble metal nanoparticles and titania nanotubes with visible light responses, sustainable antimicrobial activity, and osteogenic functionality.

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Preparation and Photocatalytic Performance for Degradation of Rhodamine B of AgPt/Bi4Ti3O12 Composites

Nanomaterials ◽

10.3390/nano10112206 ◽

2020 ◽

Vol 10 (11) ◽

pp. 2206

Author(s):

Gaoqian Yuan ◽

Gen Zhang ◽

Kezhuo Li ◽

Faliang Li ◽

Yunbo Cao ◽

...

Keyword(s):

Visible Light ◽

Noble Metal ◽

Rhodamine B ◽

Photocatalytic Performance ◽

Bimetallic Nanoparticles ◽

Resonance Effect ◽

Visible Region ◽

Photogenerated Electron ◽

Pt Nanoparticles ◽

Electron Hole

Loading a noble metal on Bi4Ti3O12 could enable the formation of the Schottky barrier at the interface between the former and the latter, which causes electrons to be trapped and inhibits the recombination of photoelectrons and photoholes. In this paper, AgPt/Bi4Ti3O12 composite photocatalysts were prepared using the photoreduction method, and the effects of the type and content of noble metal on the photocatalytic performance of the catalysts were investigated. The photocatalytic degradation of rhodamine B (RhB) showed that the loading of AgPt bimetallic nanoparticles significantly improved the catalytic performance of Bi4Ti3O12. When 0.10 wt% noble metal was loaded, the degradation rate for RhB of Ag0.7Pt0.3/Bi4Ti3O12 was 0.027 min−1, which was respectively about 2, 1.7 and 3.7 times as that of Ag/Bi4Ti3O12, Pt/Bi3Ti4O12 and Bi4Ti3O12. The reasons may be attributed as follows: (i) the utilization of visible light was enhanced due to the surface plasmon resonance effect of Ag and Pt in the visible region; (ii) Ag nanoparticles mainly acted as electron acceptors to restrain the recombination of photogenerated electron-hole pairs under visible light irradiation; and (iii) Pt nanoparticles acted as electron cocatalysts to further suppress the recombination of photogenerated electron-hole pairs. The photocatalytic performance of Ag0.7Pt0.3/Bi4Ti3O12 was superior to that of Ag/Bi4Ti3O12 and Pt/Bi3Ti4O12 owing to the synergistic effect between Ag and Pt nanoparticles.

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Adsorption of the Gas Molecules (NH3, C2H6O, C3H6O, CO, H2S) on noble metal (Ag, Au, Pt, Pd, Ru)–Doped MoSe2 Monolayer: A First-Principles Study

New Journal of Chemistry ◽

10.1039/d1nj01705e ◽

2021 ◽

Author(s):

Lanjuan Zhou ◽

Sujing Yu ◽

Yan Yang ◽

Qi Li ◽

Tingting Li ◽

...

Keyword(s):

Density Functional Theory ◽

Noble Metal ◽

First Principles ◽

Density Functional ◽

Noble Metals ◽

Gas Sensing ◽

Functional Theory ◽

First Principles Study ◽

Gas Molecules ◽

Sensing Performance

In this paper, the effects of five noble metals (Au, Pt, Pd, Ag, Ru) doped MoSe2 on improving gas sensing performance were predicted through density functional theory (DFT) based on...

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Single particle dual plasmonic effect for efficient organic solar cells

Applied Nanoscience ◽

10.1007/s13204-020-01641-2 ◽

2021 ◽

Author(s):

Adi Prasetio ◽

Soyeon Kim ◽

Muhammad Jahandar ◽

Dong Chan Lim

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Light Absorption ◽

Resonance Effect ◽

Localized Surface Plasmon ◽

Main Role ◽

Charge Generation ◽

One Pot ◽

Wide Range ◽

Light Reflectance

AbstractIncorporating localized surface plasmon resonance (LSPR) into organic solar cells (OSCs) is a popular method for improving the power conversion efficiency (PCE) by introducing better light absorption. In this work, we designed a one-pot synthesis of Ag@SiO2@AuNPs dual plasmons and observed an immense increase in light absorption over a wide range of wavelengths. Ag@SiO2 plays the main role in enhancing light absorption near the ultraviolet band. The silica shell can also further enhance the LSP resonance effect and prevent recombination on the surface of AgNPs. The AuNPs on the Ag@SiO2 shell exhibited strong broad visible-light absorption due to LSP resonance and decreased light reflectance. By utilizing Ag@SiO2@AuNPs, we could enhance the light absorption and photoinduced charge generation, thereby increasing the device PCE to 8.57% and Jsc to 17.67 mA cm−2, which can be attributed to the enhanced optical properties. Meanwhile, devices without LSPR nanoparticles and Ag@SiO2 LSPR only showed PCEs of 7.36% and 8.18%, respectively.

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Current Strategies for Noble Metal Nanoparticle Synthesis

Nanoscale Research Letters ◽

10.1186/s11671-021-03480-8 ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Giyaullah Habibullah ◽

Jitka Viktorova ◽

Tomas Ruml

Keyword(s):

Noble Metal ◽

Noble Metals ◽

Drug Carriers ◽

Industrial Applications ◽

Metal Nanoparticle ◽

Noble Metal Nanoparticles ◽

Synthesis Methods ◽

Gold And Silver Nanoparticles ◽

Diverse Range ◽

The Past

AbstractNoble metals have played an integral part in human history for centuries; however, their integration with recent advances in nanotechnology and material sciences have provided new research opportunities in both academia and industry, which has resulted in a new array of advanced applications, including medical ones. Noble metal nanoparticles (NMNPs) have been of great importance in the field of biomedicine over the past few decades due to their importance in personalized healthcare and diagnostics. In particular, platinum, gold and silver nanoparticles have achieved the most dominant spot in the list, thanks to a very diverse range of industrial applications, including biomedical ones such as antimicrobial and antiviral agents, diagnostics, drug carriers and imaging probes. In particular, their superior resistance to extreme conditions of corrosion and oxidation is highly appreciated. Notably, in the past two decades there has been a tremendous advancement in the development of new strategies of more cost-effective and robust NMNP synthesis methods that provide materials with highly tunable physicochemical, optical and thermal properties, and biochemical functionalities. As a result, new advanced hybrid NMNPs with polymer, graphene, carbon nanotubes, quantum dots and core–shell systems have been developed with even more enhanced physicochemical characteristics that has led to exceptional diagnostic and therapeutic applications. In this review, we aim to summarize current advances in the synthesis of NMNPs (Au, Ag and Pt).

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Comparative biological effects of spherical noble metal nanoparticles (Rh, Pd, Ag, Pt, Au) with 4–8 nm diameter

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.9.258 ◽

2018 ◽

Vol 9 ◽

pp. 2763-2774 ◽

Cited By ~ 9

Author(s):

Alexander Rostek ◽

Marina Breisch ◽

Kevin Pappert ◽

Kateryna Loza ◽

Marc Heggen ◽

...

Keyword(s):

Metal Nanoparticles ◽

Noble Metal ◽

Noble Metals ◽

Biological Effects ◽

Human Mesenchymal Stem Cells ◽

Average Diameter ◽

Vinyl Pyrrolidone ◽

Noble Metal Nanoparticles ◽

Spherical Average ◽

Size And Morphology

For a comparative cytotoxicity study, nanoparticles of the noble metals Rh, Pd, Ag, Pt, and Au (spherical, average diameter 4 to 8 nm) were prepared by reduction in water and colloidally stabilized with poly(N-vinyl pyrrolidone) (PVP). Thus, their shape, size, and surface functionalization were all the same. Size and morphology of the nanoparticles were determined by dynamic light scattering (DLS), analytical disc centrifugation (differential centrifugal sedimentation, DCS), and high-resolution transmission electron microscopy (HRTEM). Cell-biological experiments were performed to determine the effect of particle exposure on the viability of human mesenchymal stem cells (hMSCs). Except for silver, no adverse effect of any of the metal nanoparticles was observed for concentrations up to 50 ppm (50 mg L−1) incubated for 24 h, indicating that noble metal nanoparticles (rhodium, palladium, platinum, gold) that do not release ions are not cytotoxic under these conditions.

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Plasmonic photocatalysts: harvesting visible light with noble metal nanoparticles

Physical Chemistry Chemical Physics ◽

10.1039/c2cp40823f ◽

2012 ◽

Vol 14 (28) ◽

pp. 9813 ◽

Cited By ~ 583

Author(s):

Peng Wang ◽

Baibiao Huang ◽

Ying Dai ◽

Myung-Hwan Whangbo

Keyword(s):

Visible Light ◽

Metal Nanoparticles ◽

Noble Metal ◽

Noble Metal Nanoparticles

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Noble Metal Composite Porous Silk Fibroin Aerogel Fibers

Materials ◽

10.3390/ma12060894 ◽

2019 ◽

Vol 12 (6) ◽

pp. 894 ◽

Cited By ~ 4

Author(s):

Alexander Mitropoulos ◽

F. Burpo ◽

Chi Nguyen ◽

Enoch Nagelli ◽

Madeline Ryu ◽

...

Keyword(s):

Noble Metal ◽

Silk Fibroin ◽

Noble Metals ◽

Metal Salt ◽

Supercritical Drying ◽

Noble Metal Nanoparticles ◽

Metal Composite ◽

Composite Aerogel ◽

Wide Range ◽

Composite Aerogels

Nobel metal composite aerogel fibers made from flexible and porous biopolymers offer a wide range of applications, such as in catalysis and sensing, by functionalizing the nanostructure. However, producing these composite aerogels in a defined shape is challenging for many protein-based biopolymers, especially ones that are not fibrous proteins. Here, we present the synthesis of silk fibroin composite aerogel fibers up to 2 cm in length and a diameter of ~300 μm decorated with noble metal nanoparticles. Lyophilized silk fibroin dissolved in hexafluoro-2-propanol (HFIP) was cast in silicon tubes and physically crosslinked with ethanol to produce porous silk gels. Composite silk aerogel fibers with noble metals were created by equilibrating the gels in noble metal salt solutions reduced with sodium borohydride, followed by supercritical drying. These porous aerogel fibers provide a platform for incorporating noble metals into silk fibroin materials, while also providing a new method to produce porous silk fibers. Noble metal silk aerogel fibers can be used for biological sensing and energy storage applications.

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Experimental and DFT Studies of Au Deposition Over WO3/g-C3N4 Z-Scheme Heterojunction

Nano-Micro Letters ◽

10.1007/s40820-019-0345-2 ◽

2019 ◽

Vol 12 (1) ◽

Cited By ~ 9

Author(s):

Muhammad Humayun ◽

Habib Ullah ◽

Junhao Cao ◽

Wenbo Pi ◽

Yang Yuan ◽

...

Keyword(s):

Visible Light ◽

Density Functional ◽

Resonance Effect ◽

State Density ◽

Functional Theory ◽

Co Catalysts ◽

Redox Couples ◽

Bonding Interaction ◽

Wet Chemical ◽

The Stability

AbstractA typical Z-scheme system is composed of two photocatalysts which generate two sets of charge carriers and split water into H2 and O2 at different locations. Scientists are struggling to enhance the efficiencies of these systems by maximizing their light absorption, engineering more stable redox couples, and discovering new O2 and H2 evolutions co-catalysts. In this work, Au decorated WO3/g-C3N4 Z-scheme nanocomposites are fabricated via wet-chemical and photo-deposition methods. The nanocomposites are utilized in photocatalysis for H2 production and 2,4-dichlorophenol (2,4-DCP) degradation. It is investigated that the optimized 4Au/6% WO3/CN nanocomposite is highly efficient for production of 69.9 and 307.3 µmol h−1 g−1 H2 gas, respectively, under visible-light (λ > 420 nm) and UV–visible illumination. Further, the fabricated 4Au/6% WO3/CN nanocomposite is significant (i.e., 100% degradation in 2 h) for 2,4-DCP degradation under visible light and highly stable in photocatalysis. A significant 4.17% quantum efficiency is recorded for H2 production at wavelength 420 nm. This enhanced performance is attributed to the improved charge separation and the surface plasmon resonance effect of Au nanoparticles. Solid-state density functional theory simulations are performed to countercheck and validate our experimental data. Positive surface formation energy, high charge transfer, and strong non-bonding interaction via electrostatic forces confirm the stability of 4Au/6% WO3/CN interface.

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Sensitization of Perovskite Strontium Stannate SrSnO3towards Visible-Light Absorption by Doping

International Journal of Photoenergy ◽

10.1155/2014/643532 ◽

2014 ◽

Vol 2014 ◽

pp. 1-3 ◽

Cited By ~ 6

Author(s):

Hungru Chen ◽

Naoto Umezawa

Keyword(s):

Solar Energy ◽

Visible Light ◽

Band Gap ◽

Light Absorption ◽

Density Functional Calculations ◽

Density Functional ◽

Visible Light Absorption ◽

Dopant Level ◽

Strontium Stannate ◽

Hybrid Density Functional

Perovskite strontium stannate SrSnO3is a promising photocatalyst. However, its band gap is too large for efficient solar energy conversion. In order to sensitize SrSnO3toward visible-light activities, the effects of doping with various selected cations and anions are investigated by using hybrid density functional calculations. Results show that doping can result in dopant level to conduction band transitions which lie lower in energy compared to the original band gap transition. Therefore, it is expected that doping SrSnO3can induce visible-light absorption.

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