Time-resolved XAS studies reveal sequential oxidative-reductive formation of Na-doped iridium oxide films with enhanced bio-stimulating performance

被引：2

作者：

Tso, Kuang-Chih ^{[1
,2
]}

Hsieh, Yi-Chieh ^{[3
]}

Lee, Jyh-Fu ^{[4
]}

Pao, Chih-Wen ^{[4
]}

Chen, Po-Chun ^{[5
]}

Ohta, Jun ^{[2
]}

Wu, Pu-Wei ^{[3
]}

机构：

[1] Natl Yang Ming Chiao Tung Univ, Grad Degree Program Sci & Technol Accelerator Ligh, Hsinchu 300, Taiwan

[2] Nara Inst Sci & Technol, Grad Sch Sci & Technol, Div Mat Sci, 8916-5 Takayama, Ikoma, Nara 6300192, Japan

[3] Natl Yang Ming Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan

[4] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan

[5] Natl Taipei Univ Technol, Inst Mat Sci & Engn, Taipei 106, Taiwan

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2023年 / 11卷 / 05期

关键词：

X-RAY-ABSORPTION; NEURAL STIMULATION; IN-SITU; SPECTROSCOPY; DEPOSITION; IRO2;

D O I：

10.1039/d2tc02996k

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We synthesize a Na-doped iridium oxide thin film via a sequential oxidative-reductive reaction in which the Ir3+ precursor undergoes a ligand exchange and oxidation process by sodium hypochlorite and oxygen to form Ir>4+, followed by an immediate reduction step to produce Na-doped iridium oxide. Detailed reaction steps occurring in the wet chemical bath are validated by time-resolved X-ray absorption spectroscopy. Analysis using X-ray photoelectron spectroscopy indicates the composition to be Na0.44IrO1.55(OH)(1.55)(H2O)(0.73). In addition, the Na-doped iridium oxide reveals an amorphous structure with a smooth surface morphology. In electrochemical characterization, the Na-doped iridium oxide exhibits a significantly larger normalized charge storage capacity of 0.32 mC cm(-2) nm(-1) over that of sputtered iridium oxide (0.08 mC cm(-2) nm(-1)). In a cell viability test, the Na-doped iridium oxide shows a negligible bio-toxicity. In short, the Na-doped iridium oxide demonstrates promising potential as a bio-stimulating electrode for implantable bio-electronics.

引用

页码：1979 / 1987

页数：9