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Synthesis and characterization of tubular
CuS with flower-like wall from a low
temperature hydrothermal route
Lifei Chen , Wei Yu,Yang Li
School of Urban Development and Environmental Engineering, Shanghai
Second Polytechnic University, Shanghai 201209, China
Advisor：S.C.Wang
Student：Shih-Kai Shu
Outline
 Introduction
 Experimental
Procedures
 Results and Discussion
 Conclusion
 Future work
Introduction
Copper sulfide (CuS), being an important
semiconductor material, has gained much attention
because of its unique optical electrical properties and
other physical and chemical properties.
 Copper sulfide has potential applications such as solar
cells , optical filters and surperionic materials, thin
films and composite materials , high capacity cathode
material in lithium secondary batteries , nanometerscale switches, catalyst support and nonlinear optical
material , etc.
 Techniques, including selfpropagating hightemperature synthesis, sonochemical, microwave, and
CVD methods have been employed to prepare copper
sulfide.
 Also, solvothermal or hydrothermal method has opened
a fruitful route for the synthesis of copper sulfide.

The preparation of nanocrystallites with different
morphologies provides an alternative variable in tailoring
the properties of nanomaterials, which is also important
for developing them as building blocks in catalytic,
optical and electronic applications. So far, CuS powders
with tubular structure, hollowsphere, flower-like and
trepanglike morphologies, urchin-like architecture and
snowflake-like pattern, rod-like, and sphere-like
morphologies have been successfully synthesized.
 Recently, considerable efforts have focused on the
synthesis of tubular structure CuS , which is expected to
display unique physical and chemical properties suitable
for an even wider range of applications.

However, to our knowledge, the temperature of most of
existing routes used to prepare tube-like CuS crystals is
higher than 150°C.
 In this paper, we present a facile low temperature (75°C)
hydrothermal route to obtain CuS nanotube with special
flower-like sidewall, which is different from the
conventional tube-like CuS microcrystal.
 Furthermore, it has been achieved simply by adjusting the
amount of the used surfactants (CTAB).
 The asprepared tubular and flower-like CuS microcrystals
have excellent optical properties.

Experimental Procedures
Results and Discussion



X-ray diffractions of tubular (a) and flower-like (b) CuS microcrystals.
The XRD patternwas compared with the data from JCPDS card No.
06-0464. Their diffraction peaks could be indexed to the hexagonal
CuS crystal phase.
The absence of the (107) diffraction peak from the XRD patterns
indicated preferentially orientation effects of the growth direction
along the (110) plane of hexagonal CuS crystals.
SEM images of
obtained tubular (a,
a1, b, b1).
 flower-like (c, c1)
CuS microcrystals.

UV–vis absorption
spectra of tubular.
 (a) flower-like.
 (b) CuS microcrystals.

Conclusion
We present a facile method for synthesis of tubular
CuS microcrystals and flower-like CuS microspheres
by hydrothermal route at 75 °C using CuCl2·2H2O as
Cu-precursor, C2H5NS as S-source and CTAB as
template molecules.
 The concentrations of reactant and template molecules
play very important roles in controlling the
morphology of CuS products, but the exact growth
mechanism is still needed to be further investigated.
 X-ray diffraction pattern suggests that the CuS
crystals are pure hexagonal phase.
 The absorption peak in the near-IR regions is the
characteristic band for pure covellite phase of CuS.

The bands of CuS in UV and near-IR regions indicate
that the asprepared CuS are promising in the
development of photoelectric devices.
 Furthermore, the special morphologies of CuS
nanomaterials would be expected to have some potential
applications as advanced materials.

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Future work
 Paper
review
 切FIB
 利用垂直基板成長
 電化學沉積生成CuS奈米線陣列