A new experiment for use in introductory nanotechnology courses is described. This experiment allows students to fabricate metallic wires with microscale lateral dimensions and nanoscale vertical dimensions. Fabrication occurs in the capillaries of polydimethylsiloxane (PDMS) stamps modified with hydrophilic polymers. This experiment provides students with an opportunity to conduct templateassisted electrodeposition of micro-and nanomaterials, utilizing a reusable template instead of the commonly used porous, anodic alumina oxide (AAO) membranes that require dissolution to examine the wires. Fabrication of the metal wires is accomplished via the reduction of metal cations in the channels of modified PDMS stamps. In addition, this experiment introduces students to characterization using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and atomic-force microscopy (AFM). The microscale dimensions of the silver wires accommodate imaging with optical microscopy for institutions possessing limited characterization capabilities.
This manuscript describes a laboratory
experiment that provides
students with an opportunity to create conductive silver nanogrids
using polymeric templates. A microcontact-printed polyvinylpyrrolidone
grid directs the citrate-induced reduction of silver ions for the
fabrication of silver nanogrids on glass substrates. In addition to
template-directed nanofabrication, students gain experience using
a sputter coater, a scanning electron microscope, and an atomic force
microscope. Students are also introduced to elemental analysis using
energy dispersive X-ray spectroscopy. Institutions with limited characterization
capabilities can use a compound light microscope to view the structures
reported in this manuscript.
This paper describes a laboratory
exercise used to address the
ongoing need for nanotechnology-related, hands-on laboratory experiences
for undergraduate students. Determination of the electrochemical behavior
of student-fabricated silver nanogrids is reported. Students successfully
used cyclic voltammetry to analyze silver nanogrids printed using
microcontact printing and subsequent metallization. The silver nanogrids
exhibit electrochemical behavior similar to that of electrodes manufactured
in industry. Additionally, optical microscopy, atomic force microscopy,
and scanning electron microscopy were used to assess nanogrid quality
and dimensions.
This manuscript describes a laboratory exercise that
allows students
to use conductive atomic force microscopy (CAFM) for the analysis
of electrodeposited, metallic structures. In addition to nanoscale
electrical characterization with CAFM, this laboratory exercise also
provides students with an opportunity to explore nanofabrication by
electrodepositing metallic structures in the channels of a patterned,
polydimethylsiloxane (PDMS) template. The goals of this experiment
include characterization of electrodeposited structures with atomic
force microscopy (AFM), assessing the conductivity of the electrodeposited
structures by acquiring conductivity images, and determining the method
of electrical conduction using current–voltage (I–V) curves collected with CAFM.
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