Quantum Confinement Induced Excitonic Mechanism in Zinc-Oxide-Nanowalled Microrod Arrays for UV–Vis Surface-Enhanced Raman Scattering

2019 ◽  
Vol 123 (40) ◽  
pp. 24957-24962 ◽  
Author(s):  
Jayeong Kim ◽  
Tomke E. Glier ◽  
Benjamin Grimm-Lebsanft ◽  
Sören Buchenau ◽  
Melissa Teubner ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Raman Scattering ◽  
Quantum Confinement ◽  
Surface Enhanced Raman Scattering ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Excitonic Mechanism

scholarly journals Zinc Oxide Nanorod Surface-Enhanced Raman Scattering Substrates without and with Gold Nanoparticles Fabricated through Pulsed-Laser-Induced Photolysis

2020 ◽  
Vol 10 (14) ◽  
pp. 5015
Author(s):  
Chia-Man Chou ◽  
Le Tran Thanh Thi ◽  
Nguyen Thi Quynh Nhu ◽  
Su-Yu Liao ◽  
Yu-Zhi Fu ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Raman Scattering ◽  
Zno Nanorods ◽  
Pulsed Laser ◽  
Surface Enhanced Raman Scattering ◽  
Sers Substrate ◽  
Sers Signal ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

We fabricated surface-enhanced Raman scattering (SERS) substrates using gold nanoparticle (AuNP)-decorated zinc oxide (ZnO) nanorods (NRs). Prior to decoration with AuNPs, ZnO NRs on the glass substrate fabricated using the sol–gel method could enhance the SERS signal for detecting 10−5 M rhodamine 6G (R6G). Microscopic analysis revealed that the thermal-annealing process for fabricating the seed layers of ZnO facilitated the growth of ZnO NRs with the highly preferred c-axis (002) orientation. A decrease in the diameter of ZnO NRs occurred because of the use of annealed seek layers further increased the surface-to-volume ratio of ZnO NRs, resulting in an increase in the SERS signal for R6G of 10−5 M. To combine the localized surface plasmon resonance (LSPR) mode with the charge transfer (CT) mode, ZnO NRs were decorated with AuNPs through pulsed-laser-induced photolysis (PLIP). However, the preferred vertical (002) orientation of ZnO NRs was prone to the aggregation of AuNPs, which hindered the SERS signal. The experimental results revealed that ZnO NRs with the crystalline structure of horizontal (100) and (101) orientations facilitated the growth of homogeneous, independent and isolated AuNPs which serves as “hot spots” for SERS signal of detecting R6G at a low concentration of 10−9 M. Comparing to previous fabrication of SERS substrate, our method has advantage to fabricate AuNP-decorated ZnO NR in a short time. Moreover, the optimization of the SERS behaviors for different fabrication conditions of AuNPs using the PLIP method was investigated in detail.

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