High-dispersed catalysts of core–shell structured Au@SiO2 for formaldehyde catalytic oxidation

Chen, Dan; Shi, Jing; Shen, Huayao

doi:10.1016/j.cej.2019.123887

Cited by 68 publications

(19 citation statements)

References 57 publications

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“…Increasing amount of Au core also affords thinner silica shells; i.e, the hybrid particles become smaller. 70 Our hybrid Ag@AntNps and Au@AntNps behaved similarly, as pointed out by the DLS results.…”

Section: Resultssupporting

confidence: 79%

“…Higher nucleation rates reduce nanoparticle size, so a higher amount of nuclei in the beginning of the synthesis should lead to smaller particles in the colloidal dispersion 63,67,71,70 . Higher amount of AgNps or AuNps in Ag@AntNps and Au@AntNps, respectively, should provide smaller hybrid particles if AgNps or AuNps acted as nucleation sites.…”

Section: Resultsmentioning

confidence: 99%

“…Other authors 70,72 described that high concentrations of metal nanoparticle core produce multi-core hybrid nanoparticles. Given that the concentration of anthracene was the same for all the samples synthesized here, the presence of uncovered AgNps could have resulted from the high concentration of colloidal metal, too.…”

Section: Resultsmentioning

confidence: 99%

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Multitherapeutic nanoplatform based on Scintillating Anthracene, Silver@Antracene, and Gold@Anthracene nanoparticles for combined radiation and photodynamic therapies: enhancing radiation dose while generating, trapping, probing, or delivering singlet oxygen species

Oliveira¹

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We have synthesized anthracene and metal@anthracene core-shell nanoparticles and propose that they be used as a nanoplatform that combines radiation and photodynamic therapies. Synthesis of anthracene nanoparticles in the presence of colloidal silver or gold reduced the hydrodynamic radius in a concentration-dependent manner and caused core-shell nanostructures to grow, as revealed by AFM and DLS. Besides reduced size, the core-shell nanoparticles presented enhanced fluorescence emission.Fluorescence enhancements were higher for Ag@anthracene nanoparticles and for wavelengths approaching the plasmon resonance peak, which suggested a plasmon-enhancement phenomenon. The size-dependent enhancement in fluorescence associated with the distance between the metal core and the surface area of the nanoparticles provided an optimal core-shell diameter of 100-150 nm. We investigated singlet oxygen ( 1 O2) generation by electron spin resonance spectroscopy (ESR) with a spintrap and by fluorescence spectroscopy. The ESR/spin-trap results revealed that, in the presence of a porphyrin, anthracene nanoparticles and the core-shell nanoparticles acted as energy mediators for 1 O2 generation under exposure to light. Fluorescence suppression experiments showed that the core-shell nanoparticles captured 1 O2 at higher rates because they presented smaller size and larger surface area than anthracene nanoparticles. Together, the ESR and fluorescence results suggested that overall production of 1 O2 ( 1 O2 captured by spin-trap + 1 O2 captured by surface anthracene molecules) was higher for the core-shell nanoparticles than for anthracene nanoparticles. Moreover, because of plasmon-enhanced fluorescence and larger surface area, the Ag@anthracene nanoparticles stood out as a new and more sensitive fluorescent probe for 1 O2. During irradiation with X-rays, both anthracene and Ag@anthracene nanoparticles trapped 1 O2; subsequently, they afforded sustained release of the trapped 1 O2 for up 12 days after irradiation. This could be an interesting strategy to extend the radiation therapy treatment after the irradiation sessions. Furthermore, the presence of the metallic nanoparticle in the core of the core-shell nanostructure increased interaction with X-rays, raising the radiation dose around xii the nanoparticle. Therefore, metal@anthracene nanostructures may allow cancer treatment by different approaches depending on nanoparticle configuration.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

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Multitherapeutic nanoplatform based on Scintillating Anthracene, Silver@Antracene, and Gold@Anthracene nanoparticles for combined radiation and photodynamic therapies: enhancing radiation dose while generating, trapping, probing, or delivering singlet oxygen species

Oliveira¹

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“…Various material structures have been proposed to improve the performance of catalysts in different kinds of catalytic reactions. By adjusting the structure of composites, the contacting formation between composites, [ 76–78 ] the active sites of catalysts, [ 79,80 ] the difficulty of capturing reactants, [ 81–83 ] and so on might be changed. Generally, these changes in physical and chemical properties could have a positive impact on the catalytic reaction.…”

Section: Catalytic Optimization Strategies By Microwavementioning

confidence: 99%

Microwave‐Positioning Assembly: Structure and Surface Optimizations for Catalysts

Xiao

Huo²,

Guan³

et al. 2022

Small Structures

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As an innovative synthesis and modification method for nanomaterials, microwave‐positioning assembly exhibits various advantages like low power consumption, oriented growth, and precise doping in preparing and modifying catalysts, mainly owing to the superhot characteristics under microwave irradiation. There are different types of microwave‐positioning assembly mechanisms accounting for the controlling design of the composition, structure, surface chemical state, interface bonding, and some other factors of the catalyst. This review summarizes the recent achievements on the research progress of microwave‐assisted synthesis and modification of new catalysts with the improved performances in various catalytic reactions. The problems and developments of this method in future catalyst design are simply prospected.

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“…They have great potential applications in molecular catalysis and gas sensing. [16][17][18][19][20][21][22][23] For example, a recent work reported by He, et al shows that the MOF-5 wrapped Au NPs have a strong enrichment effect of CO 2 gas, thus enabling the detection of CO 2 gas via surface-enhanced Raman spectroscopy (SERS) effect of the Au core. [22] To date, the microporous materials wrapped on a plasmonic metal NPs mainly include MOFs and microporous silica.…”

mentioning

confidence: 99%

Microporous‐Ceria‐Wrapped Gold Nanoparticles for Conductometric and SERS Dual Monitoring of Hazardous Gases at Room Temperature

Bao

Guo

Zhang

et al. 2022

Adv Materials Inter

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metal NPs have relatively high surface energy, and thus easily agglomerate and oxidize. [10] This can lead to unexpected performance losses in practical applications. In addition, bare metal NPs are limited in complex functions, such as modulated carrier transport, enhanced molecular capture, and strong charge separation. In comparison, functional material-wrapped metal NPs have promising reductions in aggregation and can offer more complex functions. [11][12][13][14][15] Among these wrapped metal NPs, microporous shell-[such as silica, and metal-organic frameworks (MOFs)] coated systems have abundant micropores and a large specific surface area. They have great potential applications in molecular catalysis and gas sensing. [16][17][18][19][20][21][22][23] For example, a recent work reported by He, et al. shows that the MOF-5 wrapped Au NPs have a strong enrichment effect of CO 2 gas, thus enabling the detection of CO 2 gas via surface-enhanced Raman spectroscopy (SERS) effect of the Au core. [22] To date, the microporous materials wrapped on a plasmonic metal NPs mainly include MOFs and microporous silica. Microporous silica has only the value as a carrier, stabilizer (for anti-agglomeration or anti-oxidization), and linking ligand. Therefore, microporous-silica-wrapped metal NPs are difficult to offer complex functions (such as strong gas-solid interaction). In contrast, MOF-wrapped metal NPs can likely achieve more functions due to their relatively high chemical activity and other properties. [18][19][20][21][22] However, most MOFs have wide band gaps and are insulators, thus, it is difficult to achieve applications in carrier transport (such as photoelectric conversion and conductometric gas sensing). In addition, the MOF micropores are easily destroyed by acidic gases and even water vapor due to their relatively low structural stability, thus resulting in dramatic performance declines in practical applications.Microporous metal oxides such as titanium dioxide (TiO 2 ), tin oxide (SnO 2 ), and cerium oxide (CeO 2 ) [24][25][26][27] have good chemical stability, strong interactions with many kinds of gas molecules, and tunable carrier transport properties. Therefore, the microporous metal-oxide-wrapped plasmonic metal NPs are This work proposes a novel and simple synthesis method for microporous-ceria-wrapped gold (Au@mp-CeO 2 ) nanoparticles (NPs) based on linker molecule-induced stacking of ultrafine CeO 2 particles (or beads) on the surface of pre-prepared gold NPs. The resulting NPs have a uniform size and microporous CeO 2 shells with a mean thickness of 28 nm and porosity of 42%. The shell is highly tunable from about 4 to 30 nm thick.

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High-dispersed catalysts of core–shell structured Au@SiO2 for formaldehyde catalytic oxidation

Cited by 68 publications

References 57 publications

Multitherapeutic nanoplatform based on Scintillating Anthracene, Silver@Antracene, and Gold@Anthracene nanoparticles for combined radiation and photodynamic therapies: enhancing radiation dose while generating, trapping, probing, or delivering singlet oxygen species

Multitherapeutic nanoplatform based on Scintillating Anthracene, Silver@Antracene, and Gold@Anthracene nanoparticles for combined radiation and photodynamic therapies: enhancing radiation dose while generating, trapping, probing, or delivering singlet oxygen species

Microwave‐Positioning Assembly: Structure and Surface Optimizations for Catalysts

Microporous‐Ceria‐Wrapped Gold Nanoparticles for Conductometric and SERS Dual Monitoring of Hazardous Gases at Room Temperature

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