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2DMatpedia in Duaer

In Duaer: Computed two-dimensional materials in 2DMatpedia by formula or elements, with band gap and chemical system. One successful search uses 1 credit.

What you get

Duaer 2DMatpedia searches an open database of single-layer (2D) materials obtained by exfoliating layered bulk crystals and by substitution, with DFT band gaps.

Pick Duaer Data → 2DMatpedia in the node creator, or open the data market. Related: Materials Cloud MC3D, JARVIS-DFT.

When to use it

Find monolayer candidates such as MoS2 or graphene analogues.
Screen 2D materials by band gap for electronics.

When not to use it

Bulk 3D crystals. Use Materials Project.
Experimental structures. Use Crystal structures (COD).

Search on the canvas

Open the node creator and pick Duaer Data → 2DMatpedia.
Fill Formula (such as MoS2) or Elements (such as Mo,S).
Limit defaults to 10, max 20. Execute.

A search uses 1 credit only when it returns rows. No rows, wrong input, or an upstream failure uses 0.

Call the API

GET https://api.duaer.com/v1/data/matpedia-2d?formula=MoS2
Authorization: Bearer <Duaer key>

The call skill below matches Copy skill in the Duaer data market, with parameters, examples, and result fields.

Call skill

Same text as Copy skill.

---
name: duaer-matpedia-2d
description: >-
  Duaer 2DMatpedia. Computed two-dimensional materials in 2DMatpedia by formula or elements, with band gap and chemical system.
  One successful search uses 1 Duaer credit.
---

# Duaer 2DMatpedia

Duaer 2DMatpedia searches an open database of single-layer (2D) materials obtained by exfoliating layered bulk crystals and by substitution, with DFT band gaps.

## When to use

- Find monolayer candidates such as MoS2 or graphene analogues.
- Screen 2D materials by band gap for electronics.

## When not to use

- Bulk 3D crystals. Use https://skills.duaer.com/materials-project.md.
- Experimental structures. Use https://skills.duaer.com/cod.md.

## Call

`GET https://api.duaer.com/v1/data/matpedia-2d?formula=MoS2`

Header: `Authorization: Bearer <Duaer key>`

Use an account key or a model API key.

Get a Duaer key: https://skills.duaer.com/keys.md

## Parameters

Provide `formula` or `elements`.

- `formula` — Formula such as MoS2. Matches the reduced formula.
- `elements` — Optional. Materials that contain all of these, such as Mo,S.
- `limit` — Optional. Rows to return, from 1 to 20. Default 10.

## Examples

- `GET https://api.duaer.com/v1/data/matpedia-2d?formula=MoS2` — MoS2 monolayers with band gaps.
- `GET https://api.duaer.com/v1/data/matpedia-2d?elements=W,Se&limit=5` — tungsten selenide layers.

## Result

The response is `{ "items": [...] }`. Each item has `source`, `title`, `url`, and `summary`, plus:

- `structureId` — provider id.
- `formula`, `formulaCell`, `elements`, `sites` — reduced formula, cell formula, elements, and atoms in the cell.
- `bandGapEv` — DFT band gap in eV.
- `chemicalSystem` — elements joined by dashes, such as Mo-S.

Fields without a value are left out.

## Credits

A search that returns at least one row uses 1 credit.
An empty search, a search that finds nothing, or a failed search uses 0.
Wrong input returns 400 with a message and uses 0.
No remaining credits returns 402 and does not search.
A missing key returns 401.

## Related

- https://skills.duaer.com/materials-cloud.md — Duaer Materials Cloud MC3D
- https://skills.duaer.com/jarvis.md — Duaer JARVIS-DFT

Questions

How many credits does a 2DMatpedia search use in Duaer?

One credit when Duaer returns rows. A search with no rows or an error uses 0.

Does Duaer 2DMatpedia hold only 2D materials?

Yes. Duaer 2DMatpedia holds single-layer materials from exfoliating layered bulk crystals and from substitution.

In this section

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Materials Cloud MC3D in Duaer

In Duaer: Relaxed 3D crystal structures computed with PBE in Materials Cloud MC3D, by formula or elements, with cell volume, energy, and source database. One successful search uses 1 credit.

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JARVIS-DFT in Duaer

In Duaer: NIST JARVIS-DFT computed materials with band gap, formation energy, energy above hull, space group, and 2D or 3D dimensionality. One successful search uses 1 credit.