title: Electrochemical sensor for detection of hydrazine based on Au@Pd core-shell nanoparticles supported on amino-functionalized TiO2 nanotubes.
abstract: In this paper, we reported a simple strategy for synthesizing well-defined TiO2NTs-Au@Pd hybrid nanostructures with prior TiO2 nanotube functionalization (F-TiO2NTs). TiO2NTs with larger surface area (BET surface area is 184.9m(2)g(-1)) were synthesized by hydrothermal method, and the NTs are anatase phase with a range of 2-3μm in length and 30-50nm in diameter after calcined at 400°C for 3h. 3-Aminopropyl-trimethoxysilane (APTMS) as a coupling agent was reacted with the surface hydroxyl groups as anchoring sites for flower-shaped bimetallic Au@Pd nanostructures, self-assembling amine functionality on the surface of TiO2NTs. Note that two faces at the interface between F-TiO2NTs with (004) plane and Au@Pd nanostructures with (111) one of cubic Au and Pd nanoparticles are compatible, benefiting to the charge transfer between two components due to their crystalline coordination. The results showed that as-prepared F-TiO2NTs-Au@Pd hybrid nanostructures modified glassy carbon electrode (GCE) exhibits high electrocatalytic activity toward hydrazine (N2H4) at low potential and a linear response from 0.06 to 700μM with the detection limit for N2H4 was found to be 1.2×10(-8)M (S/N=3). Based on scan rate effect during the hydrazine oxidation, it indicates that the number of electrons transferred in the rate-limiting step is 1, and a transfer coefficient (α) is estimated as 0.73. The self-assembled F-TiO2NTs-Au@Pd hybrid nanostructures as enhanced materials present excellent electrocatalytic activity, fast response, highly sensitive and have a promising application potential in nonenzymatic sensing.
authors.affiliation: School of Science, Honghe University, Mengzi, Yunnan 661100, China; College of Chemistry and Chemical Engineering, Qishan Campus, Fuzhou University, Fuzhou, Fujian 350108, China; Fujian Key Lab of Medical Instrument & Pharmaceutical Technology, Yishan Campus, Fuzhou University, Fuzhou, Fujian 350002, China.
authors.forename: Xianlan
authors.initials: X
authors.lastname: Chen
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Lele
authors.initials: L
authors.lastname: Tang
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Haibo
authors.initials: H
authors.lastname: Pan
authors.forename: Min
authors.initials: M
authors.lastname: Du
mesh_terms: D000588:Amines / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D005898:Glass / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D006834:Hydrazines / Q000032:analysis*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D010165:Palladium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D000588:Amines; D006834:Hydrazines; C009495:titanium dioxide; C029424:hydrazine; D010165:Palladium; D002244:Carbon; D006046:Gold; D014025:Titanium
keywords: Amino-functionalized TiO(2) nanotubes; Electrocatalytic activity; Flower-shaped Au@Pd nanostructures; Hybrid nanostructures; Hydrazine