Pulumati N.B., Urs Mb K., Mandal S. et al. · AIP Advances · 2020 · 085105
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.
ZIF-8 strong ammonia response is attributed to ammonia affinity toward Zn2+ sites; replacing Zn with Co, even partially, sharply lowers ammonia sensitivity.
Caveat: The Zn-ammonia coordination argument is supported by literature citations and sensor trends rather than direct in situ spectroscopy in this paper.
p005-p006 · Gas sensing studies · Fig. 5 · Linked to 4 structured results
The 50-50 Zn/Co sample has a composition/phase ambiguity: the paper describes it as a uniform homogeneous solid with Zn/Co site occupancy, while porosity discussion calls it a physical mixture of ZIF-8 and ZIF-67 with corresponding pore sizes.
Caveat: This extraction preserves both statements and marks the sample composition_status as mixed_metal.
p002-p004 · Introduction; Structural characterizations · Fig. 1; Table I; Fig. S4 · Linked to 4 structured results
ZIF-8, ZIF-67, and the 50-50 sample are assigned as isostructural ZIF frameworks, with the mixed sample showing peak positions spanning the two end members.
Caveat: The mixture is described with both homogeneous-solid and physical-mixture language.
p003-p004 · Structural characterizations · Fig. 1; Table S1 · Linked to 4 structured results
Gas response in these conductometric ZIF sensors is governed by metal-ion-specific changes in hopping probability rather than generic ligand reactivity.
Caveat: Mechanistic claim is inferred from comparative gas response and shared linker identity.
p006 · Gas sensing studies · Fig. 5(d); Fig. S7 · Linked to 5 structured results
The 50-50 Zn/Co mixture transport is dominated by a Co/ZIF-67-like low-resistance pathway, because its Mott-temperature-related slope closely matches ZIF-67.
Caveat: Exact mixed-metal synthesis and local phase distribution are not fully specified.
p005 · Electrical transport studies · Fig. 4 · Linked to 3 structured results
Conductivity in the wide-bandgap ZIFs is assigned to Mott-like three-dimensional variable range hopping of charge carriers near the Fermi level rather than simple thermal activation to band-like states.
Caveat: No R2 values or raw conductivity tables are reported.
p005-p006 · Electrical transport studies; Conclusion · Fig. 4 · Linked to 7 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| ZIF-67Browse family: ZIF-67 / Co(mIm)₂ | Co(methylimidazolate)2 / Co-based zeolitic imidazolate framework; exact empirical formula not reportedCo2+ metal ion sites · 2-methylimidazolate / methyl imidazole ligand | 3D · PristineIsostructural zeolitic imidazolate framework; cubic I-43m structure assigned from XRD. | p002-p003 · Introduction; Structural characterizations · Fig. 1 |
| ZIF-8Browse family: ZIF-8 / Zn(mIm)₂ | Zn(methylimidazolate)2 / Zn-based zeolitic imidazolate framework; exact empirical formula not reportedZn2+ metal ion sites · 2-methylimidazolate / methyl imidazole ligand | 3D · PristineIsostructural zeolitic imidazolate framework; cubic I-43m structure assigned from XRD. | p002-p003 · Introduction; Structural characterizations · Fig. 1 |
| 50-50 Zn/Co ZIF mixture | Zn:Co (1:1) zeolitic imidazolate framework mixture / mixed-metal ZIF; exact empirical formula not reportedZn2+ and Co2+ metal ion sites in nominal 1:1 ratio · 2-methylimidazolate / methyl imidazole ligand | 3D · PristineIsostructural ZIF sample with broad XRD peak spanning ZIF-8 and ZIF-67 peak positions; SI EDS mapping shows Zn and Co distributed in the mixture. | p002-p003 · Introduction; Structural characterizations · Fig. 1 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| As-synthesised ZIF-67 powderresearch_0349__mat__mat_zif67 | Powder · Target Sample · Pristine Framework | Aqueous synthesis from cobalt nitrate hexahydrate and 2-methylimidazole; centrifuged and washed with DI water. | p003 · Experimental |
| ZIF-67 conductometric gas sensor deviceresearch_0349__mat__mat_zif67 | Electrode · Target Sample · Pristine Framework | MOF powder drop-cast from ethanol onto Au interdigitated electrodes and dried at room temperature for about 1 h.Gold interdigitated electrodes on ceramic substrate | p002 · Details of sensor device fabrication and gas sensing measurements |
| As-synthesised ZIF-8 powderresearch_0349__mat__mat_zif8 | Powder · Target Sample · Pristine Framework | Aqueous synthesis from zinc nitrate hexahydrate and 2-methylimidazole; centrifuged and washed with DI water. | p003 · Experimental |
| ZIF-8 conductometric gas sensor deviceresearch_0349__mat__mat_zif8 | Electrode · Target Sample · Pristine Framework | MOF powder drop-cast from ethanol onto Au interdigitated electrodes and dried at room temperature for about 1 h.Gold interdigitated electrodes on ceramic substrate | p002 · Details of sensor device fabrication and gas sensing measurements |
| 50-50 Zn:Co ZIF powderresearch_0349__mat__mat_zif8_zif67_50_50 | Powder · Target Sample · Mixed Metal | Nominal 50-50 Zn/Co sample; exact mixed precursor recipe is not reported in the available main or SI text. | p002-p004 · Abstract; Structural characterizations · Table I; Fig. 1 |
| 50-50 Zn:Co ZIF conductometric gas sensor deviceresearch_0349__mat__mat_zif8_zif67_50_50 | Electrode · Target Sample · Mixed Metal | 50-50 powder drop-cast from ethanol onto Au interdigitated electrodes and dried at room temperature for about 1 h.Gold interdigitated electrodes on ceramic substrate | p002 · Details of sensor device fabrication and gas sensing measurements |