PMID- 30895783
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20191120
IS  - 1520-5126 (Electronic)
IS  - 0002-7863 (Linking)
VI  - 141
IP  - 14
DP  - 2019 Apr 10
TI  - Two-Dimensional Amorphous TiO(2) Nanosheets Enabling High-Efficiency Photoinduced 
      Charge Transfer for Excellent SERS Activity.
PG  - 5856-5862
LID - 10.1021/jacs.9b00029 [doi]
AB  - Substrate-molecule vibronic coupling enhancement, especially the efficient 
      photoinduced charge transfer (PICT), is pivotal to the performance of nonmetal 
      surface-enhanced Raman scattering (SERS) technology. Here, through developing 
      novel two-dimensional (2D) amorphous TiO(2) nanosheets (a-TiO(2) NSs), we 
      successfully obtained an ultrahigh enhancement factor of 1.86 x 10(6). Utilizing 
      the Kelvin probe force microscopy (KPFM) technology, we found that these 2D 
      a-TiO(2) NSs possessed more positive surface potential than their 2D crystalline 
      counterpart (c-TiO(2) NSs). First-principles density functional theory (DFT) was 
      used to further reveal that the low coordination number of surface Ti atoms and 
      the large amount of surface oxygen defects endowed the 2D a-TiO(2) with high 
      electrostatic potential, which allowed significant charge transfer from the 
      adsorbed molecule to the 2D a-TiO(2) and facilitated the formation of a stable 
      surface charge-transfer (CT) complex. Significantly, comparing with the 2D 
      c-TiO(2), the smaller band gap and higher electronic density of states (DOS) of 
      the 2D a-TiO(2) effectively enhanced the vibronic coupling of resonances in the 
      substrate-molecule system. The strong vibronic coupling within the CT complex 
      obviously enhanced the PICT resonance and lead to the remarkable SERS activity of 
      a-TiO(2) NSs. To the best of our knowledge, this is the first report on the 
      remarkable SERS activity of 2D amorphous semiconductor nanomaterials, which may 
      bring the cutting edge of development of stable and highly sensitive nonmetal 
      SERS technology.
FAU - Wang, Xiaotian
AU  - Wang X
AD  - School of Chemistry, Beijing Advanced Innovation Center for Biomedical 
      Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and 
      Technology , Beihang University , 100191 Beijing , P. R. China.
FAU - Shi, Wenxiong
AU  - Shi W
AUID- ORCID: 0000-0002-7969-3780
AD  - School of Material Science and Engineering, State Key Laboratory of Separation 
      Membranes and Membrane Processes , Tianjin Polytechnic University , 300387 
      Tianjin , P. R. China.
FAU - Wang, Shaoxiong
AU  - Wang S
AD  - School of Chemistry, Beijing Advanced Innovation Center for Biomedical 
      Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and 
      Technology , Beihang University , 100191 Beijing , P. R. China.
FAU - Zhao, Hewei
AU  - Zhao H
AD  - School of Chemistry, Beijing Advanced Innovation Center for Biomedical 
      Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and 
      Technology , Beihang University , 100191 Beijing , P. R. China.
FAU - Lin, Jie
AU  - Lin J
AD  - School of Chemistry, Beijing Advanced Innovation Center for Biomedical 
      Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and 
      Technology , Beihang University , 100191 Beijing , P. R. China.
FAU - Yang, Zhao
AU  - Yang Z
AD  - School of Chemistry, Beijing Advanced Innovation Center for Biomedical 
      Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and 
      Technology , Beihang University , 100191 Beijing , P. R. China.
FAU - Chen, Mo
AU  - Chen M
AD  - School of Chemistry, Beijing Advanced Innovation Center for Biomedical 
      Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and 
      Technology , Beihang University , 100191 Beijing , P. R. China.
FAU - Guo, Lin
AU  - Guo L
AUID- ORCID: 0000-0002-6070-2384
AD  - School of Chemistry, Beijing Advanced Innovation Center for Biomedical 
      Engineering, Key Laboratory of Bio-Inspired Smart Interfacial Science and 
      Technology , Beihang University , 100191 Beijing , P. R. China.
LA  - eng
PT  - Journal Article
DEP - 20190328
PL  - United States
TA  - J Am Chem Soc
JT  - Journal of the American Chemical Society
JID - 7503056
EDAT- 2019/03/22 06:00
MHDA- 2019/03/22 06:01
CRDT- 2019/03/22 06:00
PHST- 2019/03/22 06:00 [pubmed]
PHST- 2019/03/22 06:01 [medline]
PHST- 2019/03/22 06:00 [entrez]
AID - 10.1021/jacs.9b00029 [doi]
PST - ppublish
SO  - J Am Chem Soc. 2019 Apr 10;141(14):5856-5862. doi: 10.1021/jacs.9b00029. Epub 
      2019 Mar 28.