If all connections were produced by only carbon deposition, then electrical contact could not be obtained due to its high resistance. Therefore, a very thin carbon layer (ca. 100 nm thick) was deposited using the EB to minimize the resistance and prevent damage to the bismuth nanowire from the Ga ion beam irradiation during tungsten deposition. The thickness of the carbon deposition was determined by considering the resistance of carbon and the depth of Ga ion penetration (30 nm). It would be preferable that all electrical contacts

be composed of only tungsten deposition; however, the FIB-SEM apparatus that was utilized in this experiment could not deposit tungsten using the EB. Therefore, Copanlisib datasheet a combination of carbon and tungsten was utilized for the electrodes on the bismuth nanowire. The opposite side electrode was also fabricated using the same procedure, as shown in Figure 2f,k. Almost all of the bismuth nanowire was not irradiated with the Ga ion beam because the bismuth nanowire was

encapsulated within the quartz template. Finally, the electrodes https://www.selleckchem.com/products/VX-809.html were divided into two parts with a 2-μm-wide groove, as shown in Figure 2g, and all electrodes were divided into eight parts, as shown in Figure 2a. Figure 2 Schematic diagrams for FIB processing to fabricate Hall measurement electrodes on a 521-nm-diameter bismuth nanowire. (a) Overall view of the fabricated sample. (b-g) Procedure for the fabrication of electrodes by FIB. (h-k) Cross-sectional view during electrode fabrication. (l) 3-D view of processing with the dual-beam FIB-SEM. Figure 3a shows an optical micrograph of the sample after FIB processing. The Ti/Cu thin films on the quartz template are divided into eight-part electrodes by FIB processing. Figure 3b,c shows SEM images of the electrical connections that formed between the bismuth nanowire and Ti/Cu thin films using FIB. The pink diagonal lines in Figure 3b,c indicate the approximate position of the bismuth nanowire embedded in the quartz template. Both side surfaces of the bismuth nanowire were connected to Ti/Cu thin films on the quartz template

by tungsten deposition. The Ti/Cu thin films on the quartz template were divided by the groove formed using FIB to insulate each part. The connections 17-DMAG (Alvespimycin) HCl of all electrodes were tested using a digital multimeter, and the electrodes were confirmed to be successfully fabricated on the bismuth nanowire by FIB processing. The nanowire sample mounted on a Si wafer was fixed to an alumina plate (23 × 16 × 0.5 mm3) with an adhesive, and gold (Au) lead wires were attached to all electrodes using silver (Ag) epoxy, as shown in the inset of Figure 4h. Au wires were connected to the measurement system through electrodes on the alumina plate. The contacts of the electrodes on the nanowire were evaluated by measuring the relationship between the current passed and the voltage.