Programmed dielectrophoretic assembly of Pd nanoparticles for conductance control in VO2 nanowires

• Published in: Current applied physics Vol. 17; no. 3; pp. 351 - 357
• Main Authors: Rathi, Servin, Kwak, Youngreal, Jing, Li, Yi, Kyung Soo, Baik, Jeong Min, Kim, Gil-Ho
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2017; 한국물리학회
• Subjects: Dielectrophoresis; Hybrid devices; Palladium nanoparticles; Vanadium dioxide nanowires; 물리학; Vanadium dioxide nanowires; Hybrid devices; Dielectrophoresis; Palladium nanoparticles
• ISSN: 1567-1739; 1878-1675
• DOI: 10.1016/j.cap.2016.12.018

Recently, hybrid nanodevices consisting of more than one type of nanomaterial, have been an intense research topic as far as science and advanced functionalities of such systems are concerned. However, lack of controlled, scalable and directed assembly techniques for these hybrid systems, particularly the accurate assembly of nanoparticles (NPs) on nanowires (NWs), has resulted in their limited applications. In the present work, a development has been reported using dielectrophoresis (DEP) technique through which a controlled assembly of palladium (Pd) NPs on VO2 NWs has been deposited. Furthermore, modulation in conductivity of VO2 NWs as a function of the NPs density is electrically measured and interpreted through work-function dependent surface doping effect of the Pd NPs on VO2 NWs. This well-controlled and scalable approach to functionalize VO2 NWs by assembling Pd NPs is significant in the view of a huge potential of Pd NPs like sensor applications thus adding functionalities to VO2 NWs. Our approach can be generalized for the large-scale assembly of a variety of NP-NW combination to fabricate advanced functional hybrid devices. [Display omitted] •Optimization of DEP technique was carried out for a control assembly of nanoparticles on vanadium dioxide nanowires.•The conductivity of nanowires was found to increase with the density of nanoparticles.•The process was found to be reproducible for prospective scalable applications like hybrid sensors.