Abstract

In this article, we show that introducing a N,N-dimethyl-formamide (DMF) solvent for silica nanosphere (SNS) monolayer spin-coating can offer a low-cost and simple spin-coating approach for SNS monolayer deposition even on large-area silicon surfaces. From our method, more than 95% monolayer coverage for a 2 in round Si surface was achieved, which is one of the highest reported coverage by a spin-coating method. We prove that DMF offers highly enhanced wettability and slow solvent evaporation rate compared to a conventional solvent, water, in addition to excellent SNS dispersibility in solution preventing SNS cluster deposition on the surface and consequently produces a close-packed SNS monolayer with good uniformity over the surface. In addition, the benefits of DMF are retained as the deposition area increases indicating its high tolerance to spin-coating area. Better than 90% SNS monolayer coverage on a 4 in Si substrate was achieved with the DMF spin-coating method. Moreover, DMF has the advantage that SNS spin-coating can be done under common ambient laboratory conditions with 100% pure DMF unlike previous approaches which require humidity and temperature controls or additional surfactant additions to the solution.

Original languageEnglish (US)
Pages (from-to)5732-5738
Number of pages7
JournalLangmuir
Volume30
Issue number20
DOIs
StatePublished - May 27 2014

Fingerprint

Nanospheres
Spin coating
Silicon Dioxide
Dimethylformamide
coating
Silica
silicon dioxide
Monolayers
Humidity control
Wettability
evaporation rate
temperature control
Silicon
Humidity
wettability
Temperature control
Surface-Active Agents
Wetting
humidity
Evaporation

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy
  • Medicine(all)

Cite this

Solvent-controlled spin-coating method for large-scale area deposition of two-dimensional silica nanosphere assembled layers. / Choi, Jea Young; Alford, Terry; Honsberg, Christiana.

In: Langmuir, Vol. 30, No. 20, 27.05.2014, p. 5732-5738.

Research output: Contribution to journalArticle

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