Deng W.-H., Li Q.-H., Chen J. et al. · Angewandte Chemie - International Edition · 2023 · e202305977
Open a family to keep every result attached to its sample, method and conditions.
Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.
H2SO4@(NH2)2-MIL-125 functions as a high-performance chemiresistive humidity sensor with 0.06-100% RH range, 0.06% RH LOD, high response and long-term stability.
Caveat: Sensor performance is reported for the authors' drop-cast device geometry; film thickness is not reported.
4 · Results · Figures 3-4; Table S3 · Linked to 5 structured results
No thermoelectric measurements were reported in the main text or SI.
Caveat: Full main and SI text layers were searched/read; extraction focused on reported electrical, sensing, structural, porosity and computational evidence.
2 · Table of Contents
The large BET surface area decrease after H2SO4 treatment supports successful impregnation of H2SO4 in (NH2)2-MIL-125.
Caveat: BET decrease supports pore filling but does not independently locate all H2SO4 molecules.
2 · Results · Figure 1d · Linked to 3 structured results
H2SO4 loading does not destroy the MIL-125-type crystal structure, and the loaded sample remains PXRD-stable after 100% RH exposure for 72 h.
Caveat: Assessment is based on powder diffraction peak matching/sharpness, not single-crystal refinement.
2 · Results · Figure 1b · Linked to 2 structured results
NH2 functionalisation and H2SO4 loading increase hydrophilicity of the MIL-125 family, lowering the water contact angle from about 24 degrees to 14 degrees.
Caveat: Contact angle values are approximate/rounded and taken from the reported Figure 1e discussion.
2 · Results · Figure 1e · Linked to 3 structured results
The NH2 groups and H2SO4 guest promote water-enhanced electronic conduction by enabling stronger electron transfer from adsorbed water to the MOF.
Caveat: Mechanistic support combines experimental current trends and DFT partial-charge calculations.
4 · Results · Figures 2e-f; Table S2 · Linked to 4 structured results
Water induces a large increase in the electronic contribution/current of H2SO4@(NH2)2-MIL-125, reaching a 10^7-fold change from dry to 100% RH conditions.
Caveat: The directly reported quantitative observable is the Wagner-derived electronic current and transference number, not a conventional four-probe conductivity value.
3 · Results · Figure 2 · Linked to 3 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| (NH2)2-MIL-125 | Ti8O8(OH)4((NH2)2-BDC)6Ti-oxo clusters · 2,5-diamino terephthalate / (NH2)2-BDC; SI synthesis also includes NH2-BDC | 3D · PristineDiamino-functionalised MIL-125 analogue with two uncoordinated NH2 groups on the benzene ring. | 2 · Results |
| H2O/H2SO4@(NH2)2-MIL-125 model system | periodic slab model of water adsorbed in H2SO4@(NH2)2-MIL-125Ti-oxo framework nodes in model · diamino-functionalised BDC linkers in model | 3D · Model SystemDFT-D periodic model with H2SO4 and water adsorption sites A1, B1 and C1. | 10 · S2.6 DFT Calculation · Figures S7-S8 |
| H2SO4@(NH2)2-MIL-125 | H2SO4 guest-loaded Ti8O8(OH)4((NH2)2-BDC)6Ti-oxo clusters · diamino-functionalised BDC linkers with H2SO4 interacting with NH2 groups | 3D · PristinePost-synthetically H2SO4-loaded (NH2)2-MIL-125; PXRD shows the crystal structure is retained after acid treatment and after 100 percent RH exposure. | 2 · Results · Figure 1b |
| MIL-125 | Ti8O8(OH)4(BDC)6Ti-oxo clusters, described as Ti8O20(OH)4 in the cage structure · 1,4-benzenedicarboxylate / H2-BDC | 3D · PristineRobust titanium MOF with octahedral and tetrahedral cages; isostructural parent of amino-functionalised MIL-125 samples. | 2 · Results · Figure S1 referenced |
| NH2-MIL-125 | Ti8O8(OH)4(NH2-BDC)6Ti-oxo clusters · 2-amino terephthalate / NH2-BDC | 3D · PristineAmino-functionalised MIL-125 analogue with one free NH2 group on the benzene ring. | 2 · Results |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| (NH2)2-MIL-125 powderresearch_0660__mat__mat_diamino_mil125 | Powder · Pristine Control · Pristine Framework | solvothermally prepared powder, washed with DMF/methanol and oven dried | 3 · S1.2 Materials and Synthetic Procedures |
| (NH2)2-MIL-125 Wagner filmresearch_0660__mat__mat_diamino_mil125 | Thin Film · Pristine Control · Pristine Framework | film/membrane measured by DC Wagner polarisationPt electrodes · not reported | 9 · S2.5 · Figure S6 |
| H2SO4@(NH2)2-MIL-125 powderresearch_0660__mat__mat_h2so4_diamino_mil125 | Powder · Target Sample · Guest Loaded | (NH2)2-MIL-125 powder treated with 1 M H2SO4 in methanol and dried at 80 C overnight | 3 · S1.2 Materials and Synthetic Procedures |
| H2SO4@(NH2)2-MIL-125 at 100 percent RHresearch_0660__mat__mat_h2so4_diamino_mil125 | Powder · Target Sample · Guest Loaded | H2SO4@(NH2)2-MIL-125 after exposure to 100 percent RH for 72 h | 2 · Results · Figure 1b |
| Drop-cast H2SO4@(NH2)2-MIL-125 humidity sensorresearch_0660__mat__mat_h2so4_diamino_mil125 | Electrode · Target Sample · Guest Loaded | 20 mg MOF in 1 mL methanol stirred 12 h, 20 microL drop coated onto interdigital electrodes and dried at 80 CAd-Pd interdigital electrodes on Al2O3 substrate · 20 microL coating; electrode width and gap 0.15 mm; film thickness not reported | 4 · S1.4 Evaluation of Sensing Performance · Figures S10-S11 |
| H2SO4@(NH2)2-MIL-125 thick film with Pt electrodesresearch_0660__mat__mat_h2so4_diamino_mil125 | Thin Film · Target Sample · Guest Loaded | powder particles prepared into a thick film/membrane and connected with Pt electrodes for DC Wagner polarisationPt wires/electrodes; membrane/thick film geometry · thick film; thickness not reported | 3 · Results · Figure S5 |
| MIL-125 powderresearch_0660__mat__mat_mil125 | Powder · Pristine Control · Pristine Framework | solvothermally prepared powder, washed with DMF/methanol and oven dried | 3 · S1.2 Materials and Synthetic Procedures |
| MIL-125 Wagner filmresearch_0660__mat__mat_mil125 | Thin Film · Pristine Control · Pristine Framework | film/membrane measured by DC Wagner polarisationPt electrodes · not reported | 9 · S2.5 · Figure S6 |
| DFT model of water adsorbed in (NH2)2-MIL-125research_0660__mat__mat_diamino_mil125 | Model · Model System · Model | periodically repeated slab model for partial charge comparison | 10 · S2.6 DFT Calculation · Table S2 |
| DFT model of water adsorbed in H2SO4@(NH2)2-MIL-125research_0660__mat__mat_h2o_h2so4_diamino_model | Model · Model System · Model | periodically repeated slab model with water adsorbed at A1, B1 and C1 sites | 10 · S2.6 DFT Calculation · Figure S8; Table S2 |
| NH2-MIL-125 powderresearch_0660__mat__mat_nh2_mil125 | Powder · Pristine Control · Pristine Framework | solvothermally prepared powder, washed with DMF/methanol and oven dried | 3 · S1.2 Materials and Synthetic Procedures |