10 International Conference on Nanotechnology and Biosensors 2010巯基水杨酸+三乙胺+pvp 纳米银

2010 International Conference on Nanotechnology and Biosensors

IPCBEE vol.2 (2011) © (2011)IACSIT Press, Singapore

Preparation of Silver Nanoparticle with Different Particle Sizes for Low-Temperature Sintering

Steve Lien-Chung Hsu, Rong-Tarng Wu

Department of Materials Science & Engineering, National Cheng-Kung University

Tainan, 701-01, Taiwan, R.O.C.

E-mail address: lchsu@mail.ncku.edu.tw

Abstract—In this study, silver nanoparticles were synthesized by chemical reduction from silver nitrate using different organic compounds as the protecting agent and organic bases as the reaction promoter. The average sizes of the resulting silver nanoparticles were between 3 to 15 nm depending on the type of the protecting agent, which allowed low-temperature sintering of the metal. These suspensions of silver nanoparticles prepared by this method are free from any metal ion contamination and are suitable for use in semiconductor industry. The suspensions will be used to make micro-interconnects in integrated circuits (IC) devices by inkjet printing.

Keywords-Silver; Nanoparticles; Suspensions


A. Materials

Silver nitrate (AgNO3) was obtained from Showa Chemical Co. Triethylamine (TEA) were purchased from Tedia Company Inc. Alpha-Terpineol was obtained from J. T. Baker. Formaldehyde (HCHO, 37 wt. % in water) was purchased from Tedia Company Inc. Thiosalicylic acid (TSA) was obtained from Acros Organic. Poly(N-vinyl-2-pyrrolidone (PVP) (molecular weight ~10,000) was obtained frrom ICN Biomedical Inc.

B. Preparation of silver nanoparticles suspensions

The AgNO3 was dissolved in de-ionized water in a

I. INTRODUCTION beaker. To this solution, a protecting agent 〔poly(N-vinyl-In recent years, metallic nanoparticles have drawn a lot of 2-pyrrolidone or thiosalicylic acid or triethylamine〕was

attention due to their unusual physical and chemical added. After being stirred, HCHO solution was then added to properties, which largely differ from their bulk properties [1, the solution. Subsequently, a promoter (triethylamine or 2]. They shows unique properties such as excellent pyridine) was added drop wise. The color of the solution conductivity, chemical stability, and catalytic activity, etc. turned from clear to black. After being stirred for 200 min at which are dependent on the particle size, size distribution room temperature, the precipitates were washed several and shape [3-5]. Among all metals, silver has the highest times with ethanol, followed by centrifugation (6000 rpm, 10 electrical and thermal conductivity. Silver materials with min), to remove unbounded TEA. The particles were then zero-, one-, or two-dimensional nanostructures such as dried at room temperature under vacuum for 24 h. The silver nanoparticles, nanowires, and nanocubes are believed to nanoparticles suspensions were prepared from the dried have great potential for applications in optics, catalysis, and silver nanoparticles by re-dispersing them into alpha-other fields [6-9]. In the characteristic of silver material, the terpineol. low sintering temperature of silver nanoparticles is important

C. Characterization in flexible electronic applications [10,11].

In previous literature, to prepare silver nanoparticles The transmission electron microscopy (TEM) images of suspensions by the chemical reduction method, a protecting silver nanoparticles were obtained with a JEOL JEM-agent needs to be added, such as long-chain thiol, long-chain 1200EX transmission electron microscope operating at 120 amines, carboxylic compounds, poly(vinyl pyrrolidone) [12-KV with an Energy Dispersive Spectrometer (EDS). The X-14], etc. In addition, reagents such as formaldehyde, glycol ray diffraction (XRD) experiment was conducted on a ethylene, NaBH4 etc., are usually needed to be the reducing Rigaku D/MAX-IIIV X-ray Diffractometer using Ni-filtered agent [15-17]. In this research, we use different organic Cu-Kα radiation with a scanning rate of 4° min 1 at 30 kV compounds as the protecting agent and organic bases as the and 20 mA. The weight loss of the silver films was analyzed reaction promoter to prepare contamination-free suspensions using a TA Instrument Thermogravimetric Analyzer (TGA) of silver nanoparticles with different particle sizes for ink jet 2050 at a heating rate of 10 oC/min under air. The UV-visible printing application. spectra of the silver nanoparticle suspensions were obtained

on a Hitachi U-2001 UV-VIS spectrophotometer.

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