In situ loading of gold nanoparticles on Fe3O4@SiO2 magnetic nanocomposites and their high catalytic activity

Zheng, Jiajia; Dong, Yalei; Wang, Weifeng; Ma, Yanhua; Hu, Jing; Chen, Xiao-Jiao; Chen, Xingguo

doi:10.1039/c3nr01075a

Cited by 169 publications

(104 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Then AuNPs were formed by in situ reduction of Au 3+ by Sn 2+ leading to the Fe 3 O 4 @SiO 2 -Au magnetic nanocomposites. The Fe 3 O 4 @SiO 2 -Au MNCs showed excellent catalytic performance toward the reduction of 4-NP with a rate constant k = 1.4 × 10 −2 s −1 at 25 • C. Additionally, the recycling of the nanocatalysts was easily achieved by magnetic separation without decreasing the catalytic activities for at least seven cycles [93].…”

Section: Fe 3 O 4 @Siomentioning

confidence: 98%

Basic concepts and recent advances in nitrophenol reduction by gold- and other transition metal nanoparticles

Zhao

Feng

Huang

et al. 2015

Coordination Chemistry Reviews

701

510

View full text Add to dashboard Cite

Section: Fe 3 O 4 @Siomentioning

confidence: 98%

Basic concepts and recent advances in nitrophenol reduction by gold- and other transition metal nanoparticles

Zhao

Feng

Huang

et al. 2015

Coordination Chemistry Reviews

701

510

View full text Add to dashboard Cite

“…[27][28][29] Meanwhile, the semiconductor component AgCl also demonstrates superiority compared to the conventionally utilized oxides (e.g. TiO 2 17 █…”

Section: █ Introductionmentioning

confidence: 99%

Porous Au–Ag Alloy Particles Inlaid AgCl Membranes As Versatile Plasmonic Catalytic Interfaces with Simultaneous, in Situ SERS Monitoring

Cao

Yuan

Liu

et al. 2015

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

We present a novel porous Au-Ag alloy particles inlaid AgCl membrane as plasmonic catalytic interfaces with real-time, in situ surface-enhanced Raman spectroscopy (SERS) monitoring. The Au-Ag alloy particles inlaid AgCl membranes were obtained via a facile two-step, air-exposed, and room-temperature immersion reaction with appropriate annealing process. Owing to the designed integration of semiconductor component AgCl and noble metal Au-Ag particles, both the catalytic reduction and visible-light-driven photocatalytic activities toward organic contaminants were attained. Specifically, the efficiencies of about 94% of 4-nitrophenol (4-NP, 5 × 10(-5) M) reduction after 8 min of reaction, and degradation of rhodamine 6G (R6G, 10(-5) M) after 12 min of visible light irradiation were demonstrated. Moreover, efficiencies of above 85% of conversion of 4-NP to 4-aminophenol (4-AP) and 90% of R6G degradation were achieved as well after 6 cycles of reactions, by which robust recyclability was confirmed. Further, with distinct SERS signals generated simultaneously from the surfaces of Au-Ag particles under laser excitation, in situ SERS monitoring of the process of catalytic reactions with superior sensitivity and linearity has been realized. Overall, the capability of the Au-Ag particles inlaid AgCl membranes to provide SERS monitored catalytic and visible-light-driven photocatalytic conversion of organic pollutants, along with their mild and cost-effective fabrication method, would make sense for in-depth understanding of the mechanisms of (photo)catalytic reactions, and also future development of potable, multifunctional and integrated catalytic and sensing devices.

show abstract

“…Iron oxides as the most commonly used magnetic nanoparticles (MNPs) have attracted great interest of nanomaterial scientists from a wide range of research fields, including micro/nanoelectronics, catalysis, chemical sensing, information storage, and medical diagnostics [1][2][3][4]. Generally, surface modifications of MNPs are very important to improve their physical and chemical stability, as well as making them possess more amazing functions especially for biological application, including magnetic resonance imaging, controlled drug delivery, photothermal therapy, bio-separation and biological assays [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of magnetic core-branched Au shell nanostructures and their application in cancer-related miRNA detection via SERS

et al. 2017

View full text Add to dashboard Cite

Magnetic core gold shell nanostructures which integrate both SERS activity and superparamagnetism are widely utilized in SERS-based detection as SERS substrates, sample separation and preconcentration operators, as well as external magnetic field controlled directional carrier. However, most of the reported gold shells coated on the magnetic cores had smooth surfaces rather than branched nanostructures with enhanced SERS activity. Here, a novel type of Fe3O4-Au core-shell nanoparticles with branched gold shell was prepared by a seed-mediated method together with the shape induction agent AgNO3, and their growth process and mechanism, properties, as well as morphologically controlled synthesis were also investigated. The branched gold coated magnetic nanoparticles (B-GMNPs) with improved SERS performance were further utilized to build superparamagnetic and SERS-active capturers by assembling tetrahedral DNA onto their surfaces for sandwich-structured detection of cancer-related biomarker miRNA-21. The experimental results indicate that highly sensitive and specific detections can be obtained by the proposed SERS sensing system including B-GMNPs and tetrahedral DNA, and the limit of detection (LOD) of miRNA-21 in serum is 623 amol L −1 . These B-GMNPs can be used as good SERS substrates with the functions of external magnetic field controlled sample separation and directional enrichment for effective SERS-based biochemical sensing and detections.

show abstract

In situ loading of gold nanoparticles on Fe3O4@SiO2 magnetic nanocomposites and their high catalytic activity

Cited by 169 publications

References 67 publications

Basic concepts and recent advances in nitrophenol reduction by gold- and other transition metal nanoparticles

Basic concepts and recent advances in nitrophenol reduction by gold- and other transition metal nanoparticles

Porous Au–Ag Alloy Particles Inlaid AgCl Membranes As Versatile Plasmonic Catalytic Interfaces with Simultaneous, in Situ SERS Monitoring

Synthesis of magnetic core-branched Au shell nanostructures and their application in cancer-related miRNA detection via SERS

Contact Info

Product

Resources

About