Boric acid nanotubes, nanotips, nanorods, microtubes, and microtips

Yan Li, Rodney S. Ruoff, Robert P. H. Chang

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Thin films containing boron, carbon, and oxygen were synthesized by plasma-enhanced chemical vapor deposition (PE-CVD). When the thin films were exposed to humid atmosphere, nano- or micro-scale boric acid structures were observed to grow spontaneously. Depending on the relative humidity, temperature, and exposure time to the humid atmosphere, these boric acid structures were either nanotubes, nanotips, nanorods, microtubes, or microtips. X-ray photoelectron spectroscopy (XPS) studies on the thin film surface suggested that the thin films contained B2O3, BCO2, and C-C clusters. The relative amounts of boron, carbon, and oxygen in the thin films were about 41.3, 14, and 43.9% respectively. Secondary ion mass spectrometry (SIMS) results indicated that the elemental distribution of boron, carbon, and oxygen in the thin films was rather homogeneous. X-ray diffraction (XRD) was used to study the time evolution of these boric acid structures at 23°C and 45 ± 3% relative humidity. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images of the structures showed that the boric acid tubes and tips had a hollow structure, whereas the boric acid rods were solid. The boric acid structures dehydrated into similarly shaped amorphous structures in a vacuum. In-situ X-ray diffraction studies in a vacuum showed that at 23°C and 45 ± 3% relative humidity (at one atmosphere pressure), the dissociation rate law of the bc,ric acid structures at 250 and 500 mTorr was [-ln(1 - α)]1/2 = kt; whereas at 1000 mTorr, the dissociation rate law was [-ln(1 - α)]1/2 = kt, where α, k, and t were the fraction of decomposed reactant, the reaction rate constant, and the time, respectively.

Original languageEnglish
Pages (from-to)3276-3285
Number of pages10
JournalChemistry of Materials
Volume15
Issue number17
DOIs
Publication statusPublished - Aug 2003

Fingerprint

Nanotips
Boric acid
Nanorods
Nanotubes
Thin films
Boron
Atmospheric humidity
Carbon
Oxygen
Vacuum
X ray diffraction
Plasma enhanced chemical vapor deposition
Secondary ion mass spectrometry
Reaction rates
boric acid
Rate constants
X ray photoelectron spectroscopy
Transmission electron microscopy
Scanning electron microscopy
Acids

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

Boric acid nanotubes, nanotips, nanorods, microtubes, and microtips. / Li, Yan; Ruoff, Rodney S.; Chang, Robert P. H.

In: Chemistry of Materials, Vol. 15, No. 17, 08.2003, p. 3276-3285.

Research output: Contribution to journalArticle

Li, Yan ; Ruoff, Rodney S. ; Chang, Robert P. H. / Boric acid nanotubes, nanotips, nanorods, microtubes, and microtips. In: Chemistry of Materials. 2003 ; Vol. 15, No. 17. pp. 3276-3285.
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