Fabrication of a micrometer Ni-Cu alloy column coupled with a Cu micro-column for thermal measurement

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Title:	Fabrication of a micrometer Ni-Cu alloy column coupled with a Cu micro-column for thermal measurement
Authors:	Lin,JC;Chang,TK;Yang,JH;Jeng,JH;Lee,DL;Jiang,SB
Contributors:	機械工程研究所
Keywords:	LOCALIZED ELECTROCHEMICAL DEPOSITION;ELECTRODEPOSITION;MICROSTRUCTURES;NICKEL;MICROFABRICATION;THERMOCOUPLES;SURFACE
Date:	2009
Issue Date:	2010-06-29 18:01:53 (UTC+8)
Publisher:	中央大學
Abstract:	Micrometer Ni-Cu alloy columns have been fabricated by the micro-anode-guided electroplating (MAGE) process in the citrate bath. The surface morphology and chemical composition of the micro-columns were determined by copper concentration in the bath and by the electrical bias of MAGE. When fabricated in a bath of dilute copper (i.e. 4 mM) at lower voltages (e. g. 3.8 and 4.0 V), the alloy micro-columns revealed uniform diameter and smooth appearance. The alloy composition demonstrated an increase in the wt% ratio of Ni/Cu from 75/25, 80/20, 83/17 to 87/13 with increasing electrical bias from 3.8, 4.0, 4.2 to 4.4 V. However, it decreases from 75/25, 57/43 to 47/53 with increasing copper concentration from 4, 8 to 12 mM in the bath. Citrate plays a role in forming complexes with nickel and copper at similar reduction potentials, thus reducing simultaneously to Ni-Cu alloy. The mechanism for fabricating alloy micro-columns could be delineated on the basis of cathodic polarization of the complexes. A couple of micro-columns were fabricated using MAGE in constructing a pure copper micro-column on the top of a Ni/Cu (at 47/53) alloy micro-column. This micro-thermocouple provides a satisfactory measurement with good sensitivity and precision.
Relation:	JOURNAL OF MICROMECHANICS AND MICROENGINEERING
Appears in Collections:	[Graduate Institute of Mechanical Engineering] journal & Dissertation

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