Journal Article

PUBDB-2017-14120

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Microfluidic Synthesis of Ultrasmall AuPd Nanoparticles with a Homogeneously Mixed Alloy Structure in Fast Continuous Flow for Catalytic Applications

Tofighi, G.Extern* ; Gaur, A. ; Doronkin, D.Extern* ; Lichtenberg, H.Extern* ; Wang, W. ; Wang, D. ; Rinke, G. ; Ewinger, A. ; Dittmeyer, R. ; Grunwaldt, J.-D. (Corresponding author)Extern*

2017
ACS Publ. Washington, DC

This record in other databases:      

Please use a persistent id in citations: doi:10.1021/acs.jpcc.7b11383

Abstract: Ultrasmall Au, Pd and AuPd nanoparticles (NPs) stabilized by PVP were prepared in a microfluidic reactor with cyclone micromixers for rapid mixing of reactants. In this system, pulsation-free flow of reactants was achieved at a total flow rate of 2.6 L h-1. A rapid homogeneous mixing within 2 ms was obtained with three cyclone micromixers. Controlled NP nucleation and growth occur in a following meandering microchannel. The resulting colloidal NPs were characterized thoroughly by various complementary techniques e.g. high resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDX) and Ultraviolet-visible spectroscopy. The average NP diameter was about 1 nm with a narrow size distribution and electron microscopy showed homogeneously alloyed NPs. Moreover, the particles were supported on TiO2. for catalytic tests and further structural characterization. Electron microscopy showed a uniform distribution of NPs on the support with some aggregation. X-ray absorption spectroscopy (XAS) confirmed the formation of well-mixed AuPd alloys in NP cores with Pd-rich surfaces. Finally, 1 wt.% metal loaded supports showed catalytic activities in CO oxidation in the following order: Au/TiO2. ≥ AuxPdy/TiO2. ≥ Pd/TiO2. Hence, the physical and chemical properties of these catalysts can be fine-tuned.

---

Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. 6G3 - PETRA III (POF3-622) (POF3-622)

Experiment(s):

1. PETRA Beamline P65 (PETRA III)
2. PETRA Beamline P64 (PETRA III)

Appears in the scientific report 2017

---

Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---