The following answer is fully adopted from:

https://www.nanowerk.com/nanotechnology/introduction/introduction_to_nanotechnology_3.php

This classification is based on the number of dimensions of a material, which are outside the nanoscale (

0D are nanosized particles that have their length and width within the nanometer range, they are simply nanoparticles.

- 1D are shaped like filaments. So if you have a filament with a nanometric diameter and having a length that is much more bigger, then you have a 1D material.

- 2D are thin films. The thickness is very small but they extend in a 2 dimensional plane.

- 3D materials are the old classical shaped objects. They have a length, a width and a thickness that are relatively beyond a few nanometers.

Best wishes,

Generally, nanomaterials are classified with dimensions. Four dimensions are following namely zero, one, two, and three. Similar for carbon also

Here, Zero (0) dimensions- quantum dots, In carbon-carbon quantum dots, graphene quantum dots, carbon nanodots. Like inorganic semiconductor

One (1) dimensions- carbon nanotube (Single and multiwall) generally rod.

two (2) dimensions - Graphene nanosheet and graphene oxide nanosheet. generally NanoSheet. three (3) dimension- carbon fullerenes

This publication may also help you to find the basics- Article Green Synthesis of Carbon Dot Weak Gel from Pear Juice: Opti...

In one-dimensional nanomaterials (1D), one dimension is outside the nanoscale. This class includes nanotubes, nanorods, and nanowires. In two-dimensional nanomaterials (2D), two dimensions are outside the nanoscale. This class exhibits plate-like shapes and includes graphene, nanofilms, nanolayers, and nanocoatings