Related Experiment Video
Updated: Jul 16, 2026
11:27
Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
Semiconductor behavior of a metal-organic framework (MOF).
Mercedes Alvaro1, Esther Carbonell, Belén Ferrer
1Instituto de Tecnología Química, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 27, 2007
Summary
Metal-organic framework-5 (MOF-5) acts as a semiconductor, exhibiting charge separation upon light excitation. This MOF-5 semiconductor demonstrates potential in photocatalytic applications, including the degradation of phenol.
Area of Science:
- Materials Science
- Photochemistry
- Semiconductor Physics
Background:
- Metal-organic frameworks (MOFs) are advanced porous materials with tunable properties.
- MOF-5 is investigated for its semiconductor characteristics and potential applications.
- Understanding MOF-5's electronic properties is crucial for its use in photocatalysis.
Purpose of the Study:
- To investigate the semiconductor behavior of MOF-5 upon light excitation.
- To determine the electronic properties, such as conduction band energy and band gap, of MOF-5.
- To explore the application of MOF-5 in photoinduced electron transfer and photocatalysis.
Main Methods:
- Light excitation of MOF-5 to induce charge separation.
- Estimation of conduction band energy and band gap.
- Investigation of photoinduced electron transfer to viologen and hole oxidation of N,N,N',N'-tetramethyl-p-phenylenediamine.
- Evaluation of MOF-5 in shape-selective photocatalyzed degradation of phenol.
Main Results:
- MOF-5 exhibits semiconductor behavior with charge separation (electrons and holes) on a microsecond timescale.
- The conduction band energy of MOF-5 was estimated at 0.2 V versus NHE, with a band gap of 3.4 eV.
- Photoinduced electron transfer and hole oxidation processes were observed, generating radical cations and oxidizing specific molecules.
Conclusions:
- MOF-5 functions as a semiconductor with well-defined electronic properties.
- The observed photoinduced charge transfer processes highlight MOF-5's potential for redox reactions.
- MOF-5 shows promise as a photocatalyst for applications like the degradation of organic pollutants.
Related Concept Videos
01:24Metal-Semiconductor Junctions
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
01:25MOS Capacitor
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
01:16MOSFET
The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...
In an n-MOSFET, the structure includes n-type source and drain...
01:27Biasing of Metal-Semiconductor Junctions
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
01:22MOSFET: Enhancement Mode
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 current...
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 current...
01:17Characteristics of MOSFET
Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable quicker...
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable quicker...