Colloids and Surfaces A: Physicochem. Eng. Aspects 256 (2005) 111–115
Preparation of silver nanoparticles by chemical reduction method
Hongshui Wanga, Xueliang Qiaoa,∗, Jianguo Chena, Shiyuan Dingb
aState Key Laboratory of Plastic Forming Simulation and Die and Mould Technology,
Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China
bHubei Xinyin Noble Metal Co. Ltd., Shiyan, Hubei, PR China
Received 16 March 2004; accepted 29 December 2004
Available online 30 January 2005
In the solution containing polyvinyl pyrrolidone (PVP), silver nitrate was reduced by the glucose, and silver particles were generated. The
to AgNO3was ranged from 1.4 to 1.6, the colloid kept stable and no Ag+was traced. The particles and colloids were also analyzed by the
X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV–visible (UV–vis) spectrophotometer. The TEM photo indicated
that with the increase in PVP, the particles dispersed better; and if the weight ratio of PVP to AgNO3is no less than 1.5, the particles dispersed
individually in a colloid form. The agglomeration of particles also was influenced by the mixing speed of the reactants. The XRD spectrums
showed that the particles were silver simple substance if the reductant was sufficient and the mixing speed of the reactants was slow enough.
© 2005 Elsevier B.V. All rights reserved.
Keywords: Silver; Nanoparticles; Agglomeration
The area of nanoparticles research has witnessed tremen-
dous growth due to the unusual chemical and physical prop-
erties demonstrated by this intermediate state of matter .
Due to their small size, these crystallites exhibit novel ma-
terial properties that largely differ from the bulk properties
. Many reports on quantum size effect on photochemistry
[3–5], nonlinear optical properties of semiconductor [6,7] or
the emergence of metallic properties with the size of the par-
ticles [8–10] have appeared during the past.
Nanoparticles of noble metals are of great interest to-
day because of their possible applications in microelectron-
ics [11–14]. Silver particles play an important role in the
electronic industry. In recent years, with the higher inte-
grated density of the electronic components (small size and
precision of the electronic components), there are grow-
ing demands for a decrease in the thickness of conductive
∗Corresponding author. Tel.: +86 27 87541540; fax: +86 27 87541540.
E-mail address: email@example.com (X. Qiao).
films and a further narrowing of the width of printed cir-
cuits and the space between these circuits. It is thus re-
quired that the powders (to form the conductive films and
printing the circuits on the basement) composing the paste
should have as small in diameter as possible, and the syn-
thesis of these particles is an important task. The chemical
way is often employed to synthesize silver colloidal metal
2. Experimental procedures
(AR). The silver nitrate was provided by Hubei Xinying
Noble Metal Co. Ltd., glucose and polyvinyl pyrrolidone
(PVP) were obtained from China Medicine (Group) Shang-
hai Chemical Reagent Corp. The sodium hydroxide was pur-
chased from Tianjin Chemical Reagent Corp.
Silver nanoparticles were prepared by reducing the silver
and sodium hydroxide to accelerate the reaction.
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