Selective growth of IrO<sub>2</sub>nanorods using metalorganic chemical vapor deposition

Wang, Ginny; Tsai, Dah–Shyang; Huang, Ying‐Sheng; Korotcov, Alexandru; Yeh, Wenchang; Susanti, Diah

doi:10.1039/b514499j

Cited by 26 publications

(26 citation statements)

References 36 publications

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“…In this section, area-selective growth of IrO 2 NRs will be demonstrated on SA(012) and SA(100) substrates which consist of patterned SiO 2 as the nongrowth surface [48]. The optimal substrate temperature for selective growth is 450 • C at a chamber pressure of ∼20 Torr.…”

Section: Area-selective Growth Of Iro 2 Nanorods On α-Al 2 O 3 (012) mentioning

confidence: 99%

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Well-AlignedIrO2Nanocrystals

Korotcov

Chen

Hsu

et al. 2007

Journal of Nanomaterials

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We review the results of synthesis of well-alignedIrO2nanocrystals (NCs) on sapphire (SA), LiNbO3(LNO), LiTaO3(LTO) substrates via reactive magnetron sputtering and metal-organic chemical vapor deposition. The surface morphology and structural properties of the as-deposited NCs were characterized. Field emission scanning electron microscopy micrographs reveal that NCs grown on SA(100)/LNO(100) are vertically aligned, while the NCs on SA(012)/LTO(012) and SA(110) contain singly and doubly tilted alignments, respectively, with a tilt angle of∼35∘from the normal to the substrates. NCs grown on SA(001) show in-plane alignment with mosaic structure. The X-ray diffraction results indicate that the NCs are (001), (101), and (100) oriented on SA(100)/LNO(100), SA(012)/LTO(012)/SA(110), and SA(001) substrates, respectively. A strong substrate effect on the alignment of theIrO2NCs deposition has been demonstrated. The roles of different substrates in the formation of various textures of nanocrystallineIrO2are studied and the possible mechanisms have been discussed.

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Section: Area-selective Growth Of Iro 2 Nanorods On α-Al 2 O 3 (012) mentioning

confidence: 99%

“…IrO 2 nanorods on SA(012) patterned by the photolithographic method and selectively grown at 450 • C; (a) a stripe pattern, (b) a corner of square patch, (c) a border of populated nanorods, and (d) a border of less-populated nanorods. (Reprinted from[48] with permission from The Royal Society of Chemistry).…”

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confidence: 99%

Well-AlignedIrO2Nanocrystals

Korotcov

Chen

Hsu

et al. 2007

Journal of Nanomaterials

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“…27 IrO2 nanostructured materials were mostly synthesized by metal organic chemical vapor deposition (MOCVD) method. 23,28,29,30,31,32,33,34,25 A variety of IrO2 nanostructures have also been produced by various other techniques, including vapor phase transport process, 35 electrochemical synthesis, 13 arc vaporization, 36 hydrothermal, 4 reactive radio frequency magnetron sputtering (RFMS), 37 sol-gel, 38,39 wetness method, 9 Adams fusion method, 15,16 sulfite complex route, 14 thermal decomposition of precursor (H2IrCl6), 17 oleylamine-mediated synthesis, etc. 10 With a closer look, it can be found that many of these methods employ expensive, complex, unstable and not-environmentally-friendly iridium-containing precursors followed with tedious synthetic procedure in complicated experimental setups.…”

Section: Introductionmentioning

confidence: 99%

Ultrafine Iridium Oxide Nanorods Synthesized by Molten Salt Method toward Electrocatalytic Oxygen and Hydrogen Evolution Reactions

Ahmed

Mao

2016

Electrochimica Acta

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Ultrafine iridium oxide nanorods (IrO2 NRs) were successfully synthesized using a molten salt method at 650 o C. The structural and morphological characterizations of these IrO2 NRs were carried out by powder X-ray diffraction, Raman spectroscopy and electron microscopic techniques. Compared to commercial IrO2 nanoparticles (IrO2 NPs) and previous reports, these IrO2 NRs show enhanced electrocatalytic activity to oxygen and hydrogen evolution reactions by passing either N2 or O2 gas in a 0.5 M KOH electrolyte before electrochemical measurements, including cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. Specifically, the current densities from the as-synthesized IrO2 NRs and commercial IrO2 NPs were measured in 0.5 M KOH electrolyte to be 70 and 58 (OER, deaerated, at 0.6 V versus Ag/AgCl), 71 and 61 (OER, O2, from-0.10 to 1.0 V versus Ag/AgCl at 50 mV/s), and 25 and 14 (HER, deaerated, at-1.4 V versus Ag/AgCl) mA/cm 2 , respectively. These results are comparable with, and in most cases, higher than reported data in the literature. Therefore, the current study reports not only a novel synthetic process for IrO2 but also a high efficient IrO2 nanostructure, and it is expected that these IrO2 NRs can serve as a benchmark in the development of active OER and HER (photo)electrocatalysts for various applications.

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“…IrO 2 nanorods can be grown by metalorganic chemical vapour deposition (MOCVD) on sapphire substrate consisting of patterned SiO 2 as the nongrowth surface. [312] TiO 2 nanorods can be obtained on a large scale by the nonhydrolytic sol-gel ester elimination reaction. [313] Here, the reaction is carried out between titanium(IV) isopropoxide and oleic acid at 543 K to generate 3.4 nm diameter crystalline TiO 2 nanorods.…”

Section: Synthesismentioning

confidence: 99%