Facile synthesis of an organic/inorganic hybrid 2D structure tincone film by molecular layer deposition

• Published in: Dalton transactions : an international journal of inorganic chemistry 2022-02, Vol.51 (5), p.1829-1837
• Main Authors: Baek, GeonHo, Lee, Seunghwan, Kim, Hye-mi, Choi, Su Hwan, Park, Jin-Seong
• Format: Article
• Language: English
• Subjects: Annealing; Aromatic compounds; Benzene; Crystal structure; Crystals; Deposition; Graphitization; Grazing incidence; Hydrocarbons; Hydroquinone; Hydroxyl groups; Molecular structure; Oxidation; Photoelectrons; Precursors; Pyrolysis; Raman spectroscopy; Spectrum analysis; Stacking; X ray photoelectron spectroscopy; X-ray scattering
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d1dt02984c

Organic/inorganic hybrid tincone films were deposited by molecular layer deposition (MLD) using N , N ′- tert -butyl-1,1-dimethylethylenediamine stannylene( ii ) as a precursor and hydroquinone (HQ) as an organic reactant. From previous studies it is known that SnO can be fabricated through a reaction with H 2 O, which has low oxidizing power. Similarly, when combined with HQ having a bi-functional hydroxyl group, SnO-based 2D hybrid tincones can be produced. In most aromatic ring-based metalcones described in previous studies, graphitization by pyrolysis occurred during post-annealing. In this study of tincones fabricated with a divalent precursor after a vacuum post-annealing process, the structural rearrangement of the SnO and the benzene ring bonds proceeded to form a SnO-based hybrid 2D structure. The rearrangement of the resulting structure occurred through π-π stacking (without pyrolysis) of the benzene ring. To understand the mechanism of fabrication of 2D hybrid tincones by π-π stacking of the benzene ring and the increase of the crystallinity of SnO after the annealing process, the structural rearrangement was observed using X-ray photoelectron spectroscopy (XPS), grazing incidence X-ray diffraction (GIXRD), grazing-incidence wide-angle X-ray scattering (GIWAXS), and Raman spectroscopy. Thereafter, the design of the crystal structure was investigated. ALD/MLD hybrid 2D tincone films were investigated structurally post-annealing. GIWAXS showed that individual benzene ring bonds were combined with the SnO layer in a repeated arrangement of the tincone monomer.