Effect of Benzene Derivatives as Guest Molecules on Semiconductor Properties of MOF‐199

Abstract

A metal organic framework, MOF‐199, has been synthesized under solvothermal conditions. Powder X‐ray diffraction (PXRD) pattern, Fourier‐transform infrared spectra (FT‐IR) and scanning electron microscopic images (SEM) confirmed the formation of the expected MOF‐199 structure. The semiconductor properties of MOF‐199 were then fine‐tuned by introducing three benzene derivatives as guest molecules (aniline, m‐aminobenzoic acid and p‐benzoquinone). Modified MOF‐199 samples were characterized using PXRD and FT‐IR. Mott‐Schottky analysis and solid‐state UV‐visible spectroscopy were used to investigate the semiconductor properties of these materials. Once MOF was modified with benzene derivatives, slight changes in d spacing values of PXRD patterns and appearance of new peaks in FT‐IR spectra were observed. The Mott‐Schottky analysis of modified MOF‐199 demonstrated an enhancement in the carrier concentration up to 83 % and a negative potential shift of the flat band potential compared to pure MOF‐199, indicating a higher degree of band bending. According to the solid‐state UV‐visible spectra, doping with organic molecules reduced the bandgap in modified MOF‐199. Thus, this study evidently showcases the potential of fine‐tuning the semiconductor properties of a MOF according to the requirement that allows a single MOF to be utilized in a variety of applications with a simple modification.

The Analytical Possibilities of FT-IR Spectroscopy Powered by Vibrating Molecules

“…In the field of modern electronics, FT-IR spectroscopy is used primarily for the qualitative assessment of the composition of semiconductor materials [ 96 , 97 , 98 , 99 , 100 , 101 , 102 ].…”

“…Research on the doping of semiconductors with organic compounds should be considered interesting. Studies in this field for aniline, m -aminobenzoic acid and p -benzoquinone are summarised in the article [ 98 ]. The degree of doping of metallic spatial lattices was assessed using FT-IR.…”

Application of Metal-Organic Framework-Based Composites for Gas Sensing and Effects of Synthesis Strategies on Gas-Sensitive Performance

“…Le Ouay et al [61] prepared MIL-101(Cr)⊃ PEDOT with different polymer contents by introducing uniformly dispersed EDOT monomers in MIL-101(Cr) by evaporating the solvent, followed by oxidative polymerization in the pores by iodine vapor to obtain PEDOT. It was found that PEDOT belongs to a P-type semiconductor and can be used for NO 2 detection [264][265][266][267][268]. PEDOT mainly functions as an active and conductive material here.…”

The light-responsive oxidase-like activity of MIL-125-NH2@Pd and its application in the determination of casein phosphopeptides

“…Moreover, the inherent coordination between metals or metal clusters and organic linkers in MOFs provides great flexibility in modulating their semiconductor properties to enhance the sensitivity of light collection and light response. 15 In particular, titanium in MIL-125-NH 2 can be reversibly switched between the two oxidation states (Ti 4+ and Ti 3+ ), providing the opportunity to employ MIL-125-NH 2 oxidase mimicking materials for developing colorimetric sensors. On the other hand, Pd nanocrystals show excellent oxidase and peroxidase-like catalyze activities.…”