Improving surface-enhanced Raman scattering properties of TiO2 nanoparticles by metal Co doping

Yang, Libin; Qin, Xiaoyu; Gong, Mengdi; Jiang, Xin; Yang, Ming; Li, Xiuling; Li, Guangzhi

doi:10.1016/j.saa.2013.12.087

Cited by 23 publications

(10 citation statements)

References 26 publications

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“…Based on the XPS results and UV-vis spectra discussed above, the doped Zn ions further increase the surface defect content. These surface defects tend to catch electrons and form the surface states energy level (E SS ), which is supposed to be located between the VB and CB of the Zn–ZrO 2 NPs [41].…”

Section: Resultsmentioning

confidence: 99%

Improved Surface-Enhanced Raman Scattering Properties of ZrO2 Nanoparticles by Zn Doping

Mao

Wang

et al. 2019

Nanomaterials

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In this study, ZrO2 and Zn–ZrO2 nanoparticles (NPs) with a series of Zn ion doping amounts were synthesized by the sol-gel process and utilized as substrates for surface-enhanced Raman scattering (SERS). After absorbing the probing molecule 4–mercaptobenzoic acid, the SERS signal intensities of Zn–ZrO2 NPs were all greater than that of the pure ZrO2. The 1% Zn doping concentration ZrO2 NPs exhibited the highest SERS enhancement, with an enhancement factor (EF) value of up to 104. X-ray diffraction, X-ray photoelectron spectroscopy, Ultraviolet (UV) photoelectron spectrometer, UV–vis spectroscopy, Transmission Electron Microscope (TEM), and Raman spectroscopy were used to characterize the properties of Zn–ZrO2 NPs and explore the mechanisms behind the SERS phenomenon. The charge transfer (CT) process is considered to be responsible for the SERS performance of 4–MBA adsorbed on Zn–ZrO2. The results of this study demonstrate that an appropriate doping ratio of Zn ions can promote the charge transfer process between ZrO2 NPs and probe molecules and significantly improve the SERS properties of ZrO2 substrates.

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Section: Resultsmentioning

confidence: 99%

Improved Surface-Enhanced Raman Scattering Properties of ZrO2 Nanoparticles by Zn Doping

Mao

Wang

et al. 2019

Nanomaterials

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“…Defect-induced disorders often cause the formation of surface state levels ( E SS ), 88–90 which is useful for inducing electron transition from the VB with lower excitation energy. Doping will introduce new energy states via the impurity atom, in addition to E SS levels, as is shown in the example of CT from E SS and dopant-related states in Co-doped TiO 2 to 4-MBA 90 presented in Fig. 5b .…”

Section: Influences Of Defect Engineering On Semiconductorsmentioning

confidence: 95%

Defect engineering in semiconductor-based SERS

2022

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“…In the Zn and Cu ions doped TiO 2 system, the doped metal ions can′t enter into the lattice of TiO 2 to replace the Ti 4+ ions because of their larger ionic radius than that of Ti 4+ , but they can enrich the surface states (defects) of TiO 2 NPs to promote the charge transfer from TiO 2 to molecule. In contrast, in the Fe, Co, Ni and Mn ions doped TiO 2 system,, the doped metal ions can enter into the lattice of TiO 2 to replace the Ti 4+ ions and embed abundant metal doping energy levels in the band gap of TiO 2 to promote the charge transfer from TiO 2 to molecule and the SERS enhancement of adsorbed molecules. These show that both abundant metal doping energy levels and surface states (defects) play a significant role in TiO 2 SERS enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…So far, semiconductor‐based SERS research is still in its primary stage, which is mainly reflected in that SERS enhancement ability of semiconductor is significantly weaker than noble metal substrate, and the research mainly focuses on the regularity understanding of their SERS. Recently, for improving TiO 2 NPs SERS performance, some metal ions (Zn, Cu, Mn, Fe, Co, and Ni) doping methods were employed ,. It can be found that the different metals have different dominating contributions for improvement of SERS performance of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Double Metal Co-Doping of TiO₂Nanoparticles for Improvement of their SERS Activity and Ultrasensitive Detection of Enrofloxacin: Regulation Strategy of Energy Levels

Jiang

Song

et al. 2017

ChemistrySelect

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In this paper, the strategy of double metals (Ni and Zn) codoping was carried out for improving SERS activity of TiO 2 nanoparticles (NPs). Accordingly, pure TiO 2 and different metals doped TiO 2 (Zn-TiO 2 , Ni-TiO 2 and NiÀZn-TiO 2 ) NPs substrates were synthesized by a sol-hydrothermal method. The results show that, compared to the other substrates, 4-mercaptobenzoic acid (4-MBA) probe molecules on the NiÀZn-TiO 2 exhibit the largest SERS enhancement, which is attributed to the contributions of double metals codoping. Ni and Zn codoping can simultaneously result in the abundant surface state levels and metal doping levels in the TiO 2 band gap; both of them together promote the charge transfer from TiO 2 to molecule and consequent SERS enhancement of probe molecule. And importantly, NiÀZn-TiO 2 NPs can be served as the efficient SERS-active substrate for the detection of enrofloxacin (ENR) drug. Under the optimal test conditions, the limit of detection of ENR on the 1 %Ni-1 %Zn-TiO 2 substrate can be reduced to 3 3 10 À10 M, which is far lower than the standard of European Union, and there is a good linear relationship in the wide low concentration range of 1 3 10 À4~1 3 10 À9 M.[a] Dr.

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Improving surface-enhanced Raman scattering properties of TiO2 nanoparticles by metal Co doping

Cited by 23 publications

References 26 publications

Improved Surface-Enhanced Raman Scattering Properties of ZrO2 Nanoparticles by Zn Doping

Improved Surface-Enhanced Raman Scattering Properties of ZrO2 Nanoparticles by Zn Doping

Defect engineering in semiconductor-based SERS

Double Metal Co-Doping of TiO₂Nanoparticles for Improvement of their SERS Activity and Ultrasensitive Detection of Enrofloxacin: Regulation Strategy of Energy Levels

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Improving surface-enhanced Raman scattering properties of TiO2 nanoparticles by metal Co doping

Cited by 23 publications

References 26 publications

Improved Surface-Enhanced Raman Scattering Properties of ZrO2 Nanoparticles by Zn Doping

Improved Surface-Enhanced Raman Scattering Properties of ZrO2 Nanoparticles by Zn Doping

Defect engineering in semiconductor-based SERS

Double Metal Co-Doping of TiO2Nanoparticles for Improvement of their SERS Activity and Ultrasensitive Detection of Enrofloxacin: Regulation Strategy of Energy Levels

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Double Metal Co-Doping of TiO₂Nanoparticles for Improvement of their SERS Activity and Ultrasensitive Detection of Enrofloxacin: Regulation Strategy of Energy Levels