TY - JOUR
T1 - Environmentally Friendly Processing Technology for Engineering Silicon Nanocrystals in Water with Laser Pulses
AU - Svrcek, V.
AU - Mariotti, D
AU - Cvelbar, U.
AU - Filipic, G.
AU - Lozac'h, M.
AU - McDonald, C.
AU - Tayagaki, T.
AU - Matsubara, K.
PY - 2016/8/4
Y1 - 2016/8/4
N2 - Herein, we demonstrate the customized, environmentally friendly tailoring of nanoparticles and their surface chemistry by short pulsed laser irradiation in liquids. This process allows for the formation of crystalline spherical particles exceeding several hundreds of nanometers in water from colloids of electrochemically etched silicon nanocrystals (Si-NCs), which exhibit quantum confinement effects and room-temperature stable luminescence. In particular, nanosecond (ns) pulsed laser irradiation of the Si-NC/water colloids causes the selective heating of the Si-NCs accompanied by the formation of spherical particles. In contrast, femtosecond (fs) laser pulsed irradiation induces the formation of colloidal Si-NCs with peculiar surface chemistry; in particular, fs pulses generate short-lived plasmas with more ionized species in water, which enable the surface engineering of quantum confined Si-NCs, thus limiting Si-NC agglomeration and enhancing their photoluminescent properties.
AB - Herein, we demonstrate the customized, environmentally friendly tailoring of nanoparticles and their surface chemistry by short pulsed laser irradiation in liquids. This process allows for the formation of crystalline spherical particles exceeding several hundreds of nanometers in water from colloids of electrochemically etched silicon nanocrystals (Si-NCs), which exhibit quantum confinement effects and room-temperature stable luminescence. In particular, nanosecond (ns) pulsed laser irradiation of the Si-NC/water colloids causes the selective heating of the Si-NCs accompanied by the formation of spherical particles. In contrast, femtosecond (fs) laser pulsed irradiation induces the formation of colloidal Si-NCs with peculiar surface chemistry; in particular, fs pulses generate short-lived plasmas with more ionized species in water, which enable the surface engineering of quantum confined Si-NCs, thus limiting Si-NC agglomeration and enhancing their photoluminescent properties.
KW - Silicon nanocrystals
U2 - 10.1021/acs.jpcc.6b04405
DO - 10.1021/acs.jpcc.6b04405
M3 - Article
VL - 120
SP - 18822
EP - 18830
JO - Journal Of Physical Chemistry C
JF - Journal Of Physical Chemistry C
SN - 1932-7447
IS - 33
ER -