Kinetics and Chemistry of Hydrolysis of Ultrathin, Thermally Grown Layers of Silicon Oxide as Biofluid Barriers in Flexible Electronic Systems

Yoon Kyeung Lee, Ki Jun Yu, Yerim Kim, Younghee Yoon, Zhaoqian Xie, Enming Song, Haiwen Luan, Xue Feng, Yonggang Huang, John A. Rogers

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Flexible electronic systems for bioimplants that offer long-term (multidecade) stability and safety in operation require thin, biocompatible layers that can prevent biofluid penetration. Recent work shows that ultrathin films of silicon dioxide thermally grown (TG-SiO2) on device-grade silicon wafers and then released as transferrable barriers offer a remarkable set of attributes in this context. This paper examines the chemical stability of these materials in aqueous solutions with different combinations of chemistries that are present in biofluids. Systematic measurements reveal the dependence of the dissolution rate of TG-SiO2 on concentrations of cations (Na+, K+, Mg2+, Ca2+) and anions (Cl-, HPO42-) at near-neutral pH. Certain results are consistent with previous studies on bulk samples of quartz and nanoparticles of amorphous silica; others reveal significant catalyzing effects associated with divalent cations at high pH and with specific anions at high ionic strength. In particular, Ca2+ and HPO42- greatly enhance and silicic acid greatly reduces the rates. These findings establish foundational data of relevance to predicting lifetimes of implantable devices that use TG-SiO2 as biofluid barriers, and of other classes of systems, such as environmental monitors, where encapsulation against water penetration is important.

Original languageEnglish
Pages (from-to)42633-42638
Number of pages6
JournalACS Applied Materials and Interfaces
Volume9
Issue number49
DOIs
Publication statusPublished - 2017 Dec 13

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Flexible electronics
Silicon oxides
Silicon Dioxide
Anions
Hydrolysis
Negative ions
Positive ions
Silica
Silicic Acid
Quartz
Kinetics
Ultrathin films
Chemical stability
Divalent Cations
Ionic strength
Silicon wafers
Encapsulation
Cations
Dissolution
Nanoparticles

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Lee, Yoon Kyeung ; Yu, Ki Jun ; Kim, Yerim ; Yoon, Younghee ; Xie, Zhaoqian ; Song, Enming ; Luan, Haiwen ; Feng, Xue ; Huang, Yonggang ; Rogers, John A. / Kinetics and Chemistry of Hydrolysis of Ultrathin, Thermally Grown Layers of Silicon Oxide as Biofluid Barriers in Flexible Electronic Systems. In: ACS Applied Materials and Interfaces. 2017 ; Vol. 9, No. 49. pp. 42633-42638.
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Kinetics and Chemistry of Hydrolysis of Ultrathin, Thermally Grown Layers of Silicon Oxide as Biofluid Barriers in Flexible Electronic Systems. / Lee, Yoon Kyeung; Yu, Ki Jun; Kim, Yerim; Yoon, Younghee; Xie, Zhaoqian; Song, Enming; Luan, Haiwen; Feng, Xue; Huang, Yonggang; Rogers, John A.

In: ACS Applied Materials and Interfaces, Vol. 9, No. 49, 13.12.2017, p. 42633-42638.

Research output: Contribution to journalArticle

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T1 - Kinetics and Chemistry of Hydrolysis of Ultrathin, Thermally Grown Layers of Silicon Oxide as Biofluid Barriers in Flexible Electronic Systems

AU - Lee, Yoon Kyeung

AU - Yu, Ki Jun

AU - Kim, Yerim

AU - Yoon, Younghee

AU - Xie, Zhaoqian

AU - Song, Enming

AU - Luan, Haiwen

AU - Feng, Xue

AU - Huang, Yonggang

AU - Rogers, John A.

PY - 2017/12/13

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