AFM Probe Under Liquid From NaugaNeedles

(Nanowerk News) NaugaNeedles has a unique technology to selectively grow individual metallic Silver/Gallium (Ag2Ga) nanoneedles at the end of standard atomic force microscope (AFM) probes. The Ag2Ga nanoneedles have superior electrical, mechanical and chemical stability that are suitable for variety of AFM applications. Taking advantage of this technology, NaugaNeedles is proud to be the first company to commercialize conductive AFM probes that can perform in liquid environments (e.g. AFM-SECM). This unique product is called Exposed End NeedleProbe (EENP).
Figure 1 shows the SEM images of an EENP. The EENP is made by
1) growing an Ag2Ga nanoneedles on standard AFM cantilevers
2) coating the entire device with an insulated layer (e.g. Parylene)
3) selectively removing the Parylene from the end of the needle
4) exchanging the exposed needle tip with platinum to enhance the chemical stability.
AFM Probe under liquid
Figure 1. SEM images of NaugaNeedles' Exposed End NeedleProbes (EENP), before (a), and after (b) Platinum exchange.
To improve the electrical insulation of EENP, the EENP are mounted on a small ceramic chip holder as shows in Figure 2. There is a copper coating at the middle of the ceramic chip holder where a wire is soldered to it (a). The entire device is then covered by a non-conductive resin (b). This packaging also make the device handling easier and prevent the insulated later from scratch during the handling and insulation.
Exposed End NeedleProbes
Figure 2. a) Layers of EENP package b) Actual EENP device.
About NaugaNeedles
NaugaNeedles is a high-tech company, which have developed a breakthrough nanofabrication technology to grow constant diameter, silver-gallium (Ag2Ga) nanoneedles, at any preferred location (e.g. SPM Probe tips) and orientation. We can fabricate Nanoneedles from 1 to 100 micrometers in length and 25 to 1000 nm in diameter. Our goal is to advance the Needle-probe technology, develop mass production techniques and make NaugaNeedles the leading manufacturer of SPM probes in North-America. NaugaNeedles is a supplier of high performance, durable, low-cost and customized Scanning Probe Microscopy (SPM) probes, used as nano-force and nano-bio sensors in research and industrial applications.
Source: NaugaNeedles (press release)
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