Monolayer guanine and adenine on graphite in NaCl solution

A comparative STM and AFM study

Nongjian Tao, Z. Shi

Research output: Contribution to journalArticle

123 Citations (Scopus)

Abstract

Nucleation, growth, and molecular packing structures of monolayer guanine and adenine on graphite have been studied in NaCl aqueous solution (containing guanine and adenine) using both STM and AFM. Guanine and adenine condense into monolayer films on graphite spontaneously. The films dissolve at low substrate potentials, starting either from step edges or by developing pits in the films, and they grow back at high potentials. Both the nuclei in the growth and the pits in the dissolution processes tend to be line shaped, which suggests anisotropic line tensions for the monolayer islands. High resolution AFM images show that guanine molecules pack into a rectangular lattice, on the basis of which a hydrogen bonded network model is proposed. In sharp contrast, high resolution STM images reveal more complex features including a superperiodic structure superimposed on the ordered guanine lattice. The superperiodic structure can be attributed to an electronic modulation of the underlying graphite lattice on the guanine lattice. Both AFM and STM show that adenine packs into a centered rectangular lattice, from which a hydrogen bonded network model is also deduced. The molecular packing structures of monolayer guanine and adenine measured by by AFM are independent of the substrate potential over a broad potential range, while the electronic states probed by STM are sensitive to the potential. The STM images also depend upon tip-substrate bias and tunneling current.

Original languageEnglish (US)
Pages (from-to)1464-1471
Number of pages8
JournalJournal of Physical Chemistry
Volume98
Issue number5
StatePublished - 1994
Externally publishedYes

Fingerprint

Graphite
guanines
adenines
Guanine
Adenine
Monolayers
graphite
atomic force microscopy
Image resolution
Substrates
Hydrogen
Electronic states
Dissolution
Nucleation
Modulation
high resolution
Molecules
hydrogen
electronics
dissolving

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Monolayer guanine and adenine on graphite in NaCl solution : A comparative STM and AFM study. / Tao, Nongjian; Shi, Z.

In: Journal of Physical Chemistry, Vol. 98, No. 5, 1994, p. 1464-1471.

Research output: Contribution to journalArticle

@article{fa2eb077b461496a8d52764b8a551704,
title = "Monolayer guanine and adenine on graphite in NaCl solution: A comparative STM and AFM study",
abstract = "Nucleation, growth, and molecular packing structures of monolayer guanine and adenine on graphite have been studied in NaCl aqueous solution (containing guanine and adenine) using both STM and AFM. Guanine and adenine condense into monolayer films on graphite spontaneously. The films dissolve at low substrate potentials, starting either from step edges or by developing pits in the films, and they grow back at high potentials. Both the nuclei in the growth and the pits in the dissolution processes tend to be line shaped, which suggests anisotropic line tensions for the monolayer islands. High resolution AFM images show that guanine molecules pack into a rectangular lattice, on the basis of which a hydrogen bonded network model is proposed. In sharp contrast, high resolution STM images reveal more complex features including a superperiodic structure superimposed on the ordered guanine lattice. The superperiodic structure can be attributed to an electronic modulation of the underlying graphite lattice on the guanine lattice. Both AFM and STM show that adenine packs into a centered rectangular lattice, from which a hydrogen bonded network model is also deduced. The molecular packing structures of monolayer guanine and adenine measured by by AFM are independent of the substrate potential over a broad potential range, while the electronic states probed by STM are sensitive to the potential. The STM images also depend upon tip-substrate bias and tunneling current.",
author = "Nongjian Tao and Z. Shi",
year = "1994",
language = "English (US)",
volume = "98",
pages = "1464--1471",
journal = "Journal of Physical Chemistry",
issn = "0022-3654",
publisher = "American Chemical Society",
number = "5",

}

TY - JOUR

T1 - Monolayer guanine and adenine on graphite in NaCl solution

T2 - A comparative STM and AFM study

AU - Tao, Nongjian

AU - Shi, Z.

PY - 1994

Y1 - 1994

N2 - Nucleation, growth, and molecular packing structures of monolayer guanine and adenine on graphite have been studied in NaCl aqueous solution (containing guanine and adenine) using both STM and AFM. Guanine and adenine condense into monolayer films on graphite spontaneously. The films dissolve at low substrate potentials, starting either from step edges or by developing pits in the films, and they grow back at high potentials. Both the nuclei in the growth and the pits in the dissolution processes tend to be line shaped, which suggests anisotropic line tensions for the monolayer islands. High resolution AFM images show that guanine molecules pack into a rectangular lattice, on the basis of which a hydrogen bonded network model is proposed. In sharp contrast, high resolution STM images reveal more complex features including a superperiodic structure superimposed on the ordered guanine lattice. The superperiodic structure can be attributed to an electronic modulation of the underlying graphite lattice on the guanine lattice. Both AFM and STM show that adenine packs into a centered rectangular lattice, from which a hydrogen bonded network model is also deduced. The molecular packing structures of monolayer guanine and adenine measured by by AFM are independent of the substrate potential over a broad potential range, while the electronic states probed by STM are sensitive to the potential. The STM images also depend upon tip-substrate bias and tunneling current.

AB - Nucleation, growth, and molecular packing structures of monolayer guanine and adenine on graphite have been studied in NaCl aqueous solution (containing guanine and adenine) using both STM and AFM. Guanine and adenine condense into monolayer films on graphite spontaneously. The films dissolve at low substrate potentials, starting either from step edges or by developing pits in the films, and they grow back at high potentials. Both the nuclei in the growth and the pits in the dissolution processes tend to be line shaped, which suggests anisotropic line tensions for the monolayer islands. High resolution AFM images show that guanine molecules pack into a rectangular lattice, on the basis of which a hydrogen bonded network model is proposed. In sharp contrast, high resolution STM images reveal more complex features including a superperiodic structure superimposed on the ordered guanine lattice. The superperiodic structure can be attributed to an electronic modulation of the underlying graphite lattice on the guanine lattice. Both AFM and STM show that adenine packs into a centered rectangular lattice, from which a hydrogen bonded network model is also deduced. The molecular packing structures of monolayer guanine and adenine measured by by AFM are independent of the substrate potential over a broad potential range, while the electronic states probed by STM are sensitive to the potential. The STM images also depend upon tip-substrate bias and tunneling current.

UR - http://www.scopus.com/inward/record.url?scp=33751158022&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33751158022&partnerID=8YFLogxK

M3 - Article

VL - 98

SP - 1464

EP - 1471

JO - Journal of Physical Chemistry

JF - Journal of Physical Chemistry

SN - 0022-3654

IS - 5

ER -