Related Experiment Video
Updated: Feb 15, 2026
13:00
Engineering Antiviral Agents via Surface Plasmon Resonance
Published on: June 14, 2022
2.8K
Plasmonic Enhancement Coupling with Defect-Engineered TiO2-x: A Mode for Sensitive Photoelectrochemical Biosensing
Jian Shu1, Zhenli Qiu1, Shuzhen Lv1
1Key Laboratory of Analytical Science for Food Safety and Biology (MOE & Fujian Province), State Key Laboratory of Photocatalysis on Energy and Environment, Department of Chemistry, Fuzhou University , Fuzhou, Fujian 350116, People's Republic of China.
Analytical Chemistry
|February 6, 2018
Summary
This study shows that oxygen vacancies and light wavelength control the photoelectric properties of engineered titanium dioxide (TiO2-x) with gold nanoparticles. This enables a new photoelectrochemical sensing method with enhanced photocurrent for improved detection.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Titanium dioxide (TiO2) is a widely studied semiconductor material with applications in photocatalysis and sensing.
- Engineering TiO2 with oxygen vacancies and noble metal nanoparticles can enhance its optoelectronic properties.
- Photoelectrochemical (PEC) sensing offers high sensitivity and selectivity for detecting various analytes.
Purpose of the Study:
- To investigate the effect of oxygen vacancy concentration and excitation wavelength on the photoelectric response of defect-engineered TiO2.
- To develop a novel PEC sensing platform utilizing plasmonic enhancement from gold nanoparticles (Au NPs) anchored to TiO2.
- To establish an improved detection protocol with high analytical performance.
Main Methods:
- Fabrication of defect-engineered TiO2-x with controlled oxygen vacancy concentration.
- Anchoring of plasmonic Au nanoparticles onto TiO2-x via DNA hybridization.
- Photoelectrochemical measurements under varying excitation wavelengths and analysis of photocurrent response.
- Integration of exonuclease III-assisted target recycling amplification for signal enhancement.
Main Results:
- The photoelectric response of TiO2-x was significantly modulated by oxygen vacancy concentration and excitation wavelength.
- Strong plasmonic enhancement of photocurrent (several times) was observed under 585 nm excitation when Au NPs were immobilized on TiO2-x.
- The developed PEC sensing platform demonstrated excellent analytical performance when combined with target recycling amplification.
Conclusions:
- Oxygen vacancies and excitation wavelength are critical factors in tuning the PEC properties of engineered TiO2.
- DNA-templated Au NP anchoring provides an effective strategy for plasmonic enhancement in TiO2-based PEC sensors.
- The proposed PEC detection protocol offers a novel and highly sensitive method for analyte detection.
More Related Videos
Related Concept Videos
01:22MOSFET: Enhancement Mode
852
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
852
01:07What is a Mode?
26.7K
The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
26.7K
01:14Ventilatory Modes
1.6K
Mechanical ventilators are life-saving devices that support or replace spontaneous breathing. They deliver breaths to patients through varying methods known as ventilator modes. Understanding these modes is critical for healthcare providers managing patients with respiratory failure.
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...
1.6K
01:23Lumber Defects
563
Lumber defects, which can affect both the appearance and structural integrity of wood, include a variety of growth and manufacturing flaws. Growth defects such as knots and knotholes occur where branches were once attached to the tree trunk, with knotholes forming when these knots fall out. Other natural defects include decay and insect damage, which compromise the wood's strength and durability.
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...
563
00:49What is Genetic Engineering?
80.4K
Overview
80.4K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.7K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.7K