Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Antenna enhanced infrared photoinduced force imaging in aqueous
  environment with super-resolution and hypersensitivity   Tip enhanced IR spectra and imaging have been widely used in cutting-edge
studies for the in-depth understanding of the composition, structure and
function of interfaces at the nanoscale. However, molecular monolayer
sensitivity has only been demonstrated on solid/gas interfaces. In aqueous
environment, the reduced sensitivity due to strong damping of the cantilever
oscillation and background IR absorption extremely limits the practical
applications of tip enhanced IR nanospectroscopy. Here, we demonstrate
hypersensitive nanoscale IR spectra and imaging in aqueous environment with the
combination of photoinduced force (PiF) microscopy and resonant antennas. The
highly confined electromagnetic field inbetween the tip end and antenna
extremely amplifies the photoinduced force to the detectable level, while the
excitation via plasmon internal reflection mode minimizes the environmental
absorption. A polydimethylsiloxane (PDMS) layer (~1-2 nm thickness)
functionalized on the AFM tip has been successfully identified in water with
antennas of different sizes. Sampling volume of ~604 chemical bonds from PDMS
was demonstrated with sub-10 nm spatial resolution confirmed by electric (E)
field distribution mapping on antennas, which strongly suggests the desired
requirements for interfacial spectroscopy. This platform demonstrates for the
first time the application of photoinduced force microscopy in aqueous
environments, providing a brand-new configuration to achieve highly enhanced
nanoscale IR signals, which is extremely promising for future research of
interfaces and nanosystems in aqueous environments.

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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: stat
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th