Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dye-Encapsulated Zeolitic Imidazolate Framework (ZIF-71) for
  Fluorochromic Sensing of Pressure, Temperature, and Volatile Solvents   Luminescent metal-organic frameworks (MOFs) offer a multifunctional platform
for creating non-invasive sensors and tuneable optoelectronics. However,
fluorochromic materials that are photophysically resilient and show high
sensitivity towards different physical and chemical stimuli are scarce. We
report a facile host-guest nanoconfinement strategy to construct a fluorescent
hybrid material with multiple sensing capabilities. We design and fabricate a
new Guest@MOF material: comprising a zeolitic MOF (ZIF-71) as a nanoporous host
for encapsulating rhodamine B (RhB dye) guest molecules, resulting in the
RhB@ZIF-71 system with mechanochromic, thermochromic, and solvatochromic
sensing response. The fluorochromic sensing properties stem from the
nanoconfinement effect that ZIF-71 imposes on RhB monomers, yielding the H- or
J-type aggregates with tuneable photophysical and photochemical properties. For
mechanochromism, the external pressure causes an emission red shift in a linear
fashion, switching RhB guests from H-type to J-type aggregates through a shear
deformation. For thermochromism, we demonstrate a linear scaling as a function
of temperature due to the spatial restriction imposed on J-type aggregates
incarcerated in ZIF-71 pores. Harnessing the solvatochromism of RhB@ZIF-71, we
identified three diverse groups of volatile organic compounds. The multimodal
sensing response pave the way to smart applications like photonic pressure
sensors, non-invasive thermometers, and ultrasensitive chemosensors.

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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: math-ph