2020
DOI: 10.1021/acsnano.0c02880
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Ionic Liquid Gate-Induced Modifications of Step Edges at SrCoO2.5 Surfaces

Abstract: Intense electric fields developed during gating at the interface between an ionic liquid and an oxide layer have been shown to lead to significant structural and electronic phase transitions in the entire oxide layer. An archetypical example is the reversible transformation between the brownmillerite SrCoO 2.5 and the perovskite SrCoO 3 engendered by ionic liquid gating. Here we show using in situ atomic force microscopy studies with photothe… Show more

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Cited by 6 publications
(18 citation statements)
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“…In this study, however, neither of those challenges were present. Generally, materials involving ILs offer high-end applications in photonics, optics, and other areas. The presented strategy allows overcoming a general “conflict” between strength and toughness, in particular, for cellulose-based material. The next challenge is to test if the use of other cellulose solvents below their dissolution limit could lead to a similar result.…”
Section: Results and Discussionmentioning
confidence: 99%
“…In this study, however, neither of those challenges were present. Generally, materials involving ILs offer high-end applications in photonics, optics, and other areas. The presented strategy allows overcoming a general “conflict” between strength and toughness, in particular, for cellulose-based material. The next challenge is to test if the use of other cellulose solvents below their dissolution limit could lead to a similar result.…”
Section: Results and Discussionmentioning
confidence: 99%
“…Figure a presents the evolution of X-ray diffraction (XRD) spectra, in which a sharp transition in the crystal structure from the brownmillerite to perovskite phase can be observed after immersion. The serial (002)/(006)/(00 10 ) diffraction peaks in 11.28, 34.18, and 58.60° are typical characteristics of OVCs in B-SCO. , After acid treatment, only two perovskite-type peaks appear beside the STO substrate diffractions [23.40° for (001) and 47.82° for (002) in pseudo-cubic indices, out-of-plane lattice constant c = 3.80 Å], which is nearly identical to a SrCoO 3 film on STO (001) reported previously . However, the emergent perovskite phase is metastable and inclined to transform back to B-SCO, especially in ultrahigh vacuum (UHV, ∼2 × 10 –9 mbar) or annealing at 120–140 °C at ambient atmosphere, as shown in Figure b (thus, we call it M-SCO to denote its metastability).…”
Section: Resultsmentioning
confidence: 92%
“…13 Building on the ability to thermally cycle between P and BM in thin-film perovskite cobaltites, 55,56 recent work in ionic-liquid/ion-gel/ionic-conductor-based transistors established electrical cycling (i.e., gating) between these phases. [11][12][13][14]16,[19][20][21][24][25][26][27]31 As illustrated in Figure 1(b), ionic-liquid/gel-based transistors achieve reduction of P SrCoO 3−δ to BM SrCoO 2.5 under positive V g (left panel), and oxidation of BM SrCoO 2.5 to P SrCoO 3−δ under negative V g (right panel), [11][12][13][14]16,[19][20][21][24][25][26][27]31 the requisite O for the latter likely deriving from electrochemical splitting of H 2 O in the ionic liquids/gels. 2,4,13,19 This cycling is nonvolatile, and intrinsically power-efficient due to low electrochemical gate current (I g ).…”
Section: ■ Introductionmentioning
confidence: 99%